Getting Phone number in Singapore for ACS

Question

Getting Phone number in Singapore for ACS

PF Admin2 0

We are setting up a custom app and will embed Azure Communication Services for calling.

When trying to get a phone number (supposed to be Trial), we are having this message "Your azure tenant is currently using 0 out of 1 available phone numbers (view your service limits).Request an upgrade"

We need a new phone number to test in our custom mobile app to have user token and SDK API.

Our tenant have an existing Operator connect number with Singapore Telco.

Aditya N 2,960 Reputation points Microsoft External Staff Moderator

2026-05-13T11:11:26.2066667+00:00

Hello @PF Admin2

Thank you for reaching out Microsoft Q&A, we're looking into it. We'll get back to you shortly.
Praneeth Maddali 9,595 Reputation points Microsoft External Staff Moderator

2026-05-13T13:25:49.1133333+00:00
Hi @PF Admin2

Thank you for reaching out. I understand you're trying to acquire a Singapore phone number (even for testing) in your Azure Communication Services resource for your custom mobile app, but you're seeing the message: "Your azure tenant is currently using 0 out of 1 available phone numbers... Request an upgrade."

This is expected behavior due to the following:

Trial phone numbers are US-only and not available for Singapore.

Phone number acquisition requires a paid Azure subscription (free/trial credits are not supported).

There is a default tenant-level limit (typically 1 number).

Recommended steps to resolve:

Upgrade your Azure subscription to Pay-As-You-Go (or another eligible paid plan).

In the Azure portal > Your ACS resource > Phone numbers >Get.

Select Singapore and search for available Toll-Free numbers.

Reference :

https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-singapore

https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/telephony/get-phone-number?tabs=windows&pivots=platform-azp-new

https://learn.microsoft.com/en-us/azure/communication-services/concepts/telephony/trial-phone-numbers-faq

https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/sub-eligibility-number-capability

https://learn.microsoft.com/en-us/azure/communication-services/concepts/service-limits

If Singapore numbers don't appear or you still see the upgrade prompt:

Open a support ticket under Help + Support or go to https://portal.azure.com/#create/Microsoft.Support >New support request > Service and subscription limits (quotas) for ACS phone number quota increase.

Or contact acstns@microsoft.com for special orders

Kindly let us know if the above helps or you need further assistance on this issue.

Please "upvote" if the information helped you. This will help us and others in the community as well.
PF Admin2 0 Reputation points

2026-05-14T09:22:59.5+00:00

My Azure subscription is Pay-as-you-go.

Under Phone numbers, it says 0 out of 1, which means I am not using any number right now in Azure, is it right?

But why the 'Get' button is disabled, I also emailed acstns@microsoft.com yesterday and still no reseponse from them.

I cannot raise a support request as I only have the Developer Support Plan
Praneeth Maddali 9,595 Reputation points Microsoft External Staff Moderator

2026-05-14T17:11:31.48+00:00
Hi @PF Admin2

Thank you for the update I appreciate you confirming that you’re on a Pay-As-You-Go subscription.

Before we proceed with the next steps, I’d like to gather a couple of quick details to give you the most accurate guidance:

What is the billing country/address listed on your Azure subscription? (You can check this under Cost Management + Billing > Properties)

Have you already tried assigning the Communications Services Phone Number Administrator role to your account?

Are you trying to acquire a Local or Toll-Free Singapore number?

In the meantime, here are the most effective steps for your situation:

Immediate Actions

Assign the Communications Services Phone Number Administrator role (this frequently resolves the disabled “Get” button even when quota shows 0/1).

Email acstns@microsoft.com with your Subscription ID, Tenant ID, and request for a Singapore number.

Reference :

https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-singapore

https://learn.microsoft.com/en-us/azure/communication-services/concepts/service-limits

Kindly let us know if the above helps or you need further assistance on this issue.

Please "upvote" if the information helped you. This will help us and others in the community as well.
Deleted

This comment has been deleted due to a violation of our Code of Conduct. The comment was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.
PF Admin2 0 Reputation points

2026-05-15T17:46:48.6166667+00:00
Hi,

The Billing country is in Singapore

There seems to be no Communications Services Phone Number Administrator role available in the list.

Yes local Singapore number.
Golla Venkata Pavani 5,235 Reputation points Microsoft External Staff Moderator

2026-05-19T08:58:22.6933333+00:00
Hii @PF Admin2

Thank you for the additional details. Here's a clear summary of your situation and the next best steps:

Your Pay-As-You-Go subscription and Singapore billing address meet the general paid subscription requirement.

The 0 out of 1 message is normal (default tenant-level limit for phone numbers before any are acquired).

However, Singapore phone numbers have specific restrictions based on your subscription's billing country.

Singapore numbers (Local or Toll-Free) are only available to Azure subscriptions with billing addresses in these countries/regions:

Singapore itself is not currently listed as a supported billing location for acquiring Singapore phone numbers. This is likely the root cause of the disabled Get button and the upgrade prompt.

Note on Local numbers: Singapore primarily supports Toll-Free numbers in ACS (with inbound calling capabilities). Local/geographic numbers have more restrictions.

Recommendation:

Email acstns@microsoft.com with your Subscription ID, Tenant ID, and request for a Singapore number.

Reference:
https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-singapore

https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-united-states#azure-subscription-billing-locations-where-united-states-local-and-toll-free-phone-numbers-are-available
Kindly let us know if the above helps or you need further assistance on this issue.

Please "upvote" if the information helped you. This will help us and others in the community as well.
Aditya N 2,960 Reputation points Microsoft External Staff Moderator

2026-05-21T03:22:58.7566667+00:00

Hi @PF Admin2

Please could you let us know whether the comment provided by my colleague was helpful. As mentioned earlier Singapore phone numbers have specific restrictions based on your subscription's billing country.

1 answer

Your answer

Aditya N 2,960 Reputation points Microsoft External Staff Moderator

2026-05-13T11:11:26.2066667+00:00

Hello @PF Admin2

Thank you for reaching out Microsoft Q&A, we're looking into it. We'll get back to you shortly.
PF Admin2 0 Reputation points

2026-05-14T09:22:59.5+00:00

My Azure subscription is Pay-as-you-go.

Under Phone numbers, it says 0 out of 1, which means I am not using any number right now in Azure, is it right?

But why the 'Get' button is disabled, I also emailed acstns@microsoft.com yesterday and still no reseponse from them.

I cannot raise a support request as I only have the Developer Support Plan
Praneeth Maddali 9,595 Reputation points Microsoft External Staff Moderator

2026-05-14T17:11:31.48+00:00

Hi @PF Admin2

Thank you for the update I appreciate you confirming that you’re on a Pay-As-You-Go subscription.

Before we proceed with the next steps, I’d like to gather a couple of quick details to give you the most accurate guidance:

What is the billing country/address listed on your Azure subscription? (You can check this under Cost Management + Billing > Properties)

Have you already tried assigning the Communications Services Phone Number Administrator role to your account?

Are you trying to acquire a Local or Toll-Free Singapore number?

In the meantime, here are the most effective steps for your situation:

Immediate Actions

Assign the Communications Services Phone Number Administrator role (this frequently resolves the disabled “Get” button even when quota shows 0/1).

Email acstns@microsoft.com with your Subscription ID, Tenant ID, and request for a Singapore number.

Reference :

https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-singapore

https://learn.microsoft.com/en-us/azure/communication-services/concepts/service-limits

Kindly let us know if the above helps or you need further assistance on this issue.

Please "upvote" if the information helped you. This will help us and others in the community as well.
Deleted

This comment has been deleted due to a violation of our Code of Conduct. The comment was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.
PF Admin2 0 Reputation points

2026-05-15T17:46:48.6166667+00:00

Hi,

The Billing country is in Singapore

There seems to be no Communications Services Phone Number Administrator role available in the list.

Yes local Singapore number.
Golla Venkata Pavani 5,235 Reputation points Microsoft External Staff Moderator

2026-05-19T08:58:22.6933333+00:00

Hii @PF Admin2

Thank you for the additional details. Here's a clear summary of your situation and the next best steps:

Your Pay-As-You-Go subscription and Singapore billing address meet the general paid subscription requirement.

The 0 out of 1 message is normal (default tenant-level limit for phone numbers before any are acquired).

However, Singapore phone numbers have specific restrictions based on your subscription's billing country.

Singapore numbers (Local or Toll-Free) are only available to Azure subscriptions with billing addresses in these countries/regions:

Singapore itself is not currently listed as a supported billing location for acquiring Singapore phone numbers. This is likely the root cause of the disabled Get button and the upgrade prompt.

Note on Local numbers: Singapore primarily supports Toll-Free numbers in ACS (with inbound calling capabilities). Local/geographic numbers have more restrictions.

Recommendation:

Email acstns@microsoft.com with your Subscription ID, Tenant ID, and request for a Singapore number.

Reference:
https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-singapore

https://learn.microsoft.com/en-us/azure/communication-services/concepts/numbers/phone-number-management-for-united-states#azure-subscription-billing-locations-where-united-states-local-and-toll-free-phone-numbers-are-available
Kindly let us know if the above helps or you need further assistance on this issue.

Please "upvote" if the information helped you. This will help us and others in the community as well.
Aditya N 2,960 Reputation points Microsoft External Staff Moderator

2026-05-21T03:22:58.7566667+00:00

Hi @PF Admin2

Please could you let us know whether the comment provided by my colleague was helpful. As mentioned earlier Singapore phone numbers have specific restrictions based on your subscription's billing country.

Answer 1

PF Admin2 hi & thanks for join me here at Q&A portal,

0/1 means no number assigned, not that u can self-provision one. Singapore ACS phone numbers are restricted, Operator Connect does not count, and Microsoft has to enable/approve number acquisition if the portal blocks it. the “0 out of 1 available phone numbers” means u currently have zero numbers assigned, but ur tenant/subscription limit is. It does not mean the Get flow is fully enabled. For ACS phone numbers, trial/free behavior is limited, and Microsoft docs say trial phone numbers are mainly tied to eligible trial scenarios, while purchased numbers require an eligible paid subscription and supported billing/region rules. For Singapore specifically, ACS phone number availability is limited to toll-free receive-calls capability, not full local calling/SMS like some other countries. Operator Connect numbers are separate from ACS phone numbers, so having a Singapore telco number in Teams/Operator Connect does not automatically make it usable as an ACS number. For ACS Calling SDK testing, u do not necessarily need a PSTN number if u are only testing app-to-app VoIP/user tokens. U only need an ACS phone number if u want PSTN calling to/from real phone numbers.

If the Get button is disabled even on Pay As YouGo, then this is likely subscription eligibility / phone number capability gating. The right path is to request an upgrade quota or special order for ACS phone numbers. Use Azure Support under Azure Communication Services > Phone numbers / PSTN > quota or acquisition issue, or continue with acstns@microsoft.com if the portal points there.

rgds,

Alex

&

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Getting Phone number in Singapore for ACS

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