Call forwarding: codes by carrier and phone settings

Unconditional or conditional forwarding?

There are two logics, and the choice changes your callers' experience entirely.

• Unconditional (immediate) forwarding: every call goes straight to the assistant and your phone never rings. Use it when you are on a job, in a meeting or on the road, and you do not want to miss a single call.
• Conditional forwarding: your phone rings first, and the call only moves across if you are busy, do not answer within about 20 seconds, or are unreachable. This is the safety-net setting when you would rather pick up yourself.

Unconditional forwarding codes by carrier

Replace NUMBER with your Kalyvox number in international format (+1..., +33...), dial the code from the keypad like a normal call, then press call. Confirmation appears within a second or two.

These are standard GSM (USSD) codes, identical across AT&T, T-Mobile and most European carriers. Legacy CDMA networks — Verizon and most Canadian carriers — use the *72 / *73 syntax instead, with no # at the end.

Conditional forwarding codes

These codes work on GSM networks worldwide, including AT&T and T-Mobile.

**004*NUMBER# enables all three conditions at once: the recommended setting to never lose a call while keeping the option to answer yourself.

From your phone settings

Check and turn off forwarding

• Check unconditional forwarding: dial *#21#. The screen shows whether forwarding is active and to which number.
• Check every forwarding rule: *#004#.
• Turn everything off at once: ##002#. This clears all forwarding rules, including the ones pointing at your voicemail, which you may then need to re-enable.

Forwarding is not working: what to check

• Number format: always use international format with the country code (+1 415..., not 415...). This is the number-one cause of rejected forwarding.
• "Connection problem" or "Service not available": forwarding is not enabled on your plan. Some prepaid and restricted plans exclude it — ask your carrier to switch it on, usually at no cost.
• Wi-Fi calling or VoLTE: temporarily turn off Wi-Fi calling, dial the code, then turn it back on.
• Dual SIM: the code applies to the default line. Make sure you are dialling from the right SIM.
• Cost: nothing changes for the caller. On the forwarded line, the forwarded leg is billed as an outgoing call under your plan, and is included in most unlimited plans.

Test before switching your real calls over

Enable forwarding, then call your usual line from another phone: the assistant should pick up within a few seconds. Have a full conversation, hang up, and check that the request shows up in your dashboard with the summary, the caller's number and the recording. This end-to-end test is the best way to validate both the carrier forwarding and your assistant's setup before going live.