How to Set Up Call Forwarding on T-Mobile Business
T-Mobile Business is a GSM network, which means call forwarding uses the GSM star codes (**21*, **61*, **67*) rather than the legacy *72-style codes used by Verizon or AT&T landlines. The codes work directly from the handset and don't require a portal. Forwarding to an AI-enabled number adds a real-time screening and transcription layer on top.
By Graham Thomson · Updated May 13, 2026
The short answer for T-Mobile Business
T-Mobile Business uses GSM star codes for call forwarding. The format is **<code>*<destination>#, where the code identifies the forwarding type. Dial from your T-Mobile handset and press send.
- **21*[10-digit destination]# — enable unconditional forwarding (forward all calls).
- ##21# — disable unconditional forwarding.
- **61*[10-digit destination]*11*[seconds]# — enable no-answer forwarding (forwards after the specified seconds).
- **67*[10-digit destination]# — enable busy forwarding (forwards when line is engaged).
- ##002# — disable all forwarding (unconditional + conditional).
Step-by-step from the handset
From your T-Mobile Business handset, dial the full code string and press send. T-Mobile typically displays a confirmation message on the screen rather than playing an audio tone.
- Dial **21*[10-digit destination number]# from your T-Mobile handset.
- Press send / call.
- Wait for the on-screen or audio confirmation.
- Test by calling your T-Mobile Business number from another phone.
- To disable, dial ##21# and press send.
Step-by-step from T-Mobile Business hub
T-Mobile's Business hub (mybusiness.t-mobile.com) is the administrator portal for multi-line accounts. Forwarding configuration is more limited than on Verizon or AT&T — many forwarding setups still require the GSM star codes from the handset, but the portal can enable basic forwarding on supported plans.
- Sign in to mybusiness.t-mobile.com with your administrator credentials.
- Locate the line under Lines & Devices.
- Open Call Forwarding settings if available for the plan.
- Enter the destination number and save.
What to forward to — an AI-enabled number
Forwarding to a VeraDial number turns missed calls into actionable transcripts. The AI answers, identifies itself as an AI assistant for your business, asks whether it's an emergency or a routine call, and delivers a transcript and notification to you within seconds.
- VeraDial number with STIR/SHAKEN A-level attestation on the receiving side.
- AI call screening for emergency vs. routine triage.
- Voicemail transcription on captured messages.
- $9.99/mo per line, 100 monthly credits included, 7-day free trial.
Why GSM codes look different from *72
Verizon and AT&T's legacy landline codes (*72/*73) come from the CDMA / classic telephony era. T-Mobile is GSM-based, so it uses the international GSM standard codes (**21*, **61*, **67*). The behavior is the same — only the format differs. AT&T Business wireless (post-2017) is also GSM and supports the **21* style codes as an alternative to *72.
FAQ
Why do T-Mobile codes start with ** instead of *?
T-Mobile is a GSM network, and GSM uses a different star code standard than legacy CDMA / landline. The double asterisk prefix (**21*, **61*, **67*) is part of the GSM specification for supplementary services, and the # at the end terminates the code string. It works the same as the *72 / *73 codes on Verizon and AT&T landlines — only the format differs.
Will my caller ID pass through when T-Mobile forwards calls?
Yes, in most cases. When T-Mobile forwards a call to your destination, the destination typically receives the original caller's number as the caller ID. For a VeraDial line on the receiving end, this means the AI can identify who is calling you and capture that in the transcript, even though the call routed via T-Mobile's forwarding.
Does T-Mobile charge for call forwarding?
On most postpaid T-Mobile Business plans, forwarding is included at no extra per-call charge. The leg from your T-Mobile Business line to the destination counts as an outbound call on your plan — check your minutes pool if you have a capped plan. Prepaid lines and some legacy plans may have different terms; verify with T-Mobile Business support if unsure.
Can I forward calls only after a certain number of rings?
Yes — use the no-answer code **61*[destination]*11*[seconds]# where [seconds] is typically 5, 10, 15, 20, 25, or 30. So **61*5551234567*11*20# forwards to 555-123-4567 after 20 seconds of ringing. This is the right pattern for most service businesses: your T-Mobile line rings first, and only unanswered calls reach the AI destination.
What happens if I disable forwarding incorrectly?
If forwarding is partially configured or the codes don't take effect, dial ##002# from your T-Mobile handset and press send. ##002# disables all forwarding (unconditional + conditional + busy + no-answer) on the line, returning it to default behavior. This is the safe reset if you're unsure what's configured.
Hear an AI call happen live.
Pick a scenario, verify by SMS, and watch the transcript stream as VeraDial places the call.