// call forwarding · T-Mobile

Forward missed T-Mobile calls to an AI receptionist

T-Mobile supports conditional call forwarding, so your phone rings first and only the calls you miss roll to your AI receptionist instead of voicemail. It works, we run it on live business lines, but two quirks break most first attempts. Both are covered below.

dial this exactlythen press call

**61*<number>#

Missed calls only (recommended). Your phone rings first. Use the 10-digit number, no leading 1. Replace <number>with your AI receptionist's 10-digit number.

Every call, phone never rings**21*<number>#

Check what is active*#61#

Set it up

1Turn Wi-Fi Calling off for a minute (Settings, then Phone or Calls, then Wi-Fi Calling). It can silently block the code from registering. Turn it back on after.
2Open the phone keypad and dial **61* followed by the 10-digit forwarding number, then #, then press call.
3Wait for "Setting activated" or "Registration succeeded" on screen.
4Call your number from another phone and let it ring without touching it. You should hear the AI answer after several rings.

The quirks nobody tells you

We run these setups on live business lines. These are the failure modes we actually hit.

Declined calls still go to voicemail

On T-Mobile, swiping a call away routes it down the busy path, and the busy forwarding rule refuses to register on this network (the combined **004* code fails with Setting Registration Failed). So forwarding only catches calls you let ring out. If you decline a call, it lands in your old voicemail, not the AI. Train yourself to let unknown calls ring.

Wi-Fi Calling blocks the setup codes

With Wi-Fi Calling on, the dial codes can fail to reach the network or report success without taking effect. Toggle it off while you set up, then re-enable it.

"Setting activated" is not proof

The confirmation screen only means the network stored the rule. The only real proof is a test call that rings out and gets answered by the AI. Always test.

Turning it off

Turn off missed-call forwarding##61#

Turn off all forwarding##21#

Takes effect immediately. Knowing the off switch is five seconds away makes the on switch easier to try.

the other half of the setup

A forwarding code needs something worth forwarding to

Corex's AI receptionist answers the T-Mobile calls you miss, around the clock. It answers questions about your business, books the job, takes the message, and puts urgent callers through to you. Live in minutes with a local number, from $149 a month.

Hear it answer a live call See how it works

Common questions

Does my phone still ring if I forward missed calls?

Yes. With **61* forwarding your phone rings normally, and only calls you do not answer roll to the forwarding number. It replaces voicemail, not your phone.

Does T-Mobile charge for call forwarding?

Postpaid plans include it. Some prepaid plans need it enabled by support (dial 611), occasionally at about $1 a month.

Why did the code fail with Setting Registration Failed?

Usually one of three things: Wi-Fi Calling was on, the number included a leading 1 (use 10 digits), or you dialed the combined **004* code, whose busy condition T-Mobile rejects. Use **61* alone.