Cell Phone Call Forwarding to Office: Star Codes for Verizon, AT&T, and T-Mobile — Plus a Better Option

The Real Problem — and the Better Solution

Using a personal cell number as a business line creates three problems that call forwarding only partially solves:

When you leave, the number goes with you. If an employee uses their personal cell for business calls and then leaves the company, clients have that number saved. Your business loses the relationship.

Forwarding routes the call but doesn’t integrate it. A call forwarded from your cell to the office rings the office line — but there’s no voicemail-to-email, no call recording, no CRM logging, no auto-attendant. It’s just a forwarded call.

Star code forwarding is carrier-dependent and breaks at the edges — the Verizon codes for call forwarding below differ from AT&T and T-Mobile in key ways. Not Reachable forwarding requires a Customer Service call on Verizon. Busy forwarding doesn’t work in Hunt Groups. The rules change if you switch carriers.

The actual solution is a VoIP phone system where your cell phone is a proper business extension — same extension number, same dial plan, same auto-attendant, same voicemail — running on the Linkus UC app on your existing iPhone or Android. When someone calls the main business number, it rings your desk phone and your cell simultaneously. When you call out from the Linkus app, the caller sees the business number, not your personal cell. When you leave the company, the number stays with the business.

No star codes. No manual forwarding setup. No carrier calls to Customer Service. The routing just works, everywhere, all the time.

Star Code Call Forwarding — Quick Reference

If you do need to set up call forwarding from a personal or business cell phone — for temporary coverage, a backup routing scenario, or a situation where a full VoIP system isn’t yet in place — here are the codes for the major U.S. carriers. Always verify with your carrier before activating, as codes can change and additional fees may apply.

When Star Codes Aren’t Enough

The forwarding features above work well for simple scenarios, but they’re limited in a few important ways. They’re configured individually on each person’s phone and have no central management — changing a forwarding number means dialing the code on every phone. They don’t integrate with your office system’s routing logic, so forwarded calls bypass your auto-attendant, call queue, and voicemail-to-email. And they depend on the carrier’s implementation, which varies and can change.

For businesses that need more control — on-call schedules, time-of-day routing, department-level call flows, or mobile extensions that are actual business extensions — Phonewire’s VoIP systems handle all of this at the system level. You set the routing rules once in the system configuration, and they apply consistently regardless of which device the call reaches. On-call schedule management, ring groups, and after-hours routing are all built into the system rather than depending on individual employees remembering to activate star codes.