How to Forward Calls from T-Mobile to Ringing.io
Use T-Mobile GSM star codes to forward calls to your Ringing.io number — all of them, only the ones you miss, or both.
T-Mobile is a GSM carrier, so it uses the **21* / **61* / **67* family of dial codes (the same set as AT&T) rather than the *72 codes used by Verizon and traditional landlines. T-Mobile does not natively support time-of-day or after-hours scheduling — for business hours behaviour the recommended approach is to publish your Ringing.io number and let Ringing.io handle the schedule.
Forward every call to Ringing.io
Send 100% of incoming T-Mobile calls to your Ringing.io number — your phone never rings.
- 1
Open the phone dialer
Open the standard phone / dialer app on your T-Mobile device.
- 2
Dial the GSM activation code with your Ringing.io number
Dial **21* followed immediately by your full 10-digit Ringing.io number, then press #. T-Mobile documents this as the immediate-forwarding code on its calling-services support page. The area code is required.
**21*[10-digit Ringing.io number]# - 3
Press call and wait for confirmation
Press the call button. T-Mobile returns a short confirmation message on screen ("Service was enabled" or similar) within a few seconds. Wait for the confirmation before ending the call.
- 4
Test it
Call your T-Mobile number from another phone. It should ring through to Ringing.io and your AI receptionist should pick up. Forwarding bypasses your T-Mobile visual voicemail.
How to undo: From your T-Mobile device, dial ##21# and press call. Forwarding stops immediately and your phone rings normally again.
Forward only when you miss the call (no-answer)
Your phone rings first. If you do not pick up, the call is forwarded to Ringing.io instead of going to T-Mobile visual voicemail.
- 1
Open the phone dialer
Open the standard phone / dialer app on your T-Mobile device.
- 2
Dial the no-answer forward code with your Ringing.io number
Dial **61* followed by your full 10-digit Ringing.io number, then press #. This is the GSM "Call Forwarding on No Reply" code.
**61*[10-digit Ringing.io number]# - 3
Optional — also forward when busy or unreachable
For busy forwarding, dial **67* + your Ringing.io number + #. For "unreachable" (phone off, airplane mode, no signal) forwarding, dial **62* + your Ringing.io number + #. All three conditional rules can be active simultaneously.
**67* / **62* - 4
Press call and wait for confirmation
After each code, press call and wait for the on-screen confirmation.
How to undo: Dial ##61# to clear no-answer, ##67# for busy, and ##62# for unreachable. Dial ##002# to clear all conditional forwarding rules at once.
Note: Some T-Mobile users report that conditional forwarding (**61*) intermittently fails to set on certain plans / devices — particularly on prepaid and some BYOD setups. If you see no confirmation message after dialling, try the unconditional **21* code instead. T-Mobile also blocks forwarding to international numbers.
After-hours only (manual schedule)
T-Mobile does not have a native time-of-day schedule, so you have two options.
- 1
Recommended — publish your Ringing.io number
Put your Ringing.io number on your website, Google Business Profile, and signage. Configure your business hours inside Ringing.io. The AI will route in-hours calls to you (transfer to your T-Mobile line) and handle after-hours calls itself. Zero T-Mobile configuration required.
- 2
Manual alternative — toggle **21* at end of day
If you must keep your T-Mobile number published, manually dial **21* + your Ringing.io number + # when you close, and ##21# when you reopen. Some users automate this with a Shortcuts (iOS) or Tasker (Android) routine that dials the code on a schedule.
How to undo: For the manual approach, ##21# turns forwarding off at any time. For the Ringing.io-as-published-number approach, change your business hours in the Ringing.io dashboard.
Official T-Mobile documentation
Provider settings change over time. If something on this page does not match what you see on T-Mobile, the official sources below are the source of truth.
Related forwarding guides
Switching providers, or just configuring more than one line? These are the most common neighbours of T-Mobile.
Verizon
Forward your Verizon Wireless number to Ringing.io using the standard star codes. Setup takes about 30 seconds.
AT&T
Forward your AT&T Wireless number to Ringing.io using the standard GSM star codes. Setup takes about 30 seconds.
Android
Forward calls from any Android phone to Ringing.io — either through the Phone app settings (Google Phone / Samsung Phone) or with universal GSM star codes.
iPhone
Forward calls from any iPhone to Ringing.io — either through the built-in Settings menu (GSM carriers) or with universal star codes.
Frequently asked questions
Does T-Mobile charge for call forwarding?
T-Mobile does not charge a monthly fee for call forwarding on standard postpaid plans. Forwarded calls use minutes from your plan, which is a non-issue on unlimited plans (the vast majority).
Does T-Mobile call forwarding work on prepaid and Metro by T-Mobile?
Yes on most prepaid plans, though the experience can be less reliable than postpaid. Metro by T-Mobile (formerly MetroPCS) uses the same GSM codes since it runs on T-Mobile's network. If a code does not stick on prepaid, contact T-Mobile customer service to enable conditional forwarding on your line.
Will I still get text messages while forwarding is on?
Yes. T-Mobile call forwarding only redirects voice calls. SMS, MMS, and iMessage continue to arrive on your T-Mobile device as normal.
How do I tell if call forwarding is currently active?
Dial *#21# from your T-Mobile device for immediate-forwarding status, *#61# for no-answer, and *#67# for busy. T-Mobile returns the currently configured forward number on screen if one is set.
Can I forward my T-Mobile number to a non-US number?
No. T-Mobile only allows forwarding to 10- or 11-digit North American numbers. Your Ringing.io number is a US number so this is not an issue.
Does forwarding work while I am roaming internationally?
It depends on the host carrier in the country you are in. T-Mobile states that forwarding while roaming is subject to the foreign network supporting it — many do, but some prepaid networks block it. Set up forwarding before you travel for the most reliable experience.
Can I set business-hours vs after-hours forwarding rules on T-Mobile?
T-Mobile does not natively support time-of-day forwarding. The practical solution is to publish your Ringing.io number as your business line and configure business hours inside Ringing.io — Ringing.io routes in-hours calls to you and handles after-hours itself.
Don't have a Ringing.io number yet?
Get one in five minutes, set up your AI receptionist, then come back to this page to forward T-Mobile.
Last verified against T-Mobile's official documentation: 2026-05-20. Provider procedures change over time — if this guide is out of date, email support@ringing.io and we will refresh it.