Here are a list of dialer codes that can be used with Google Fi. These codes shouldn’t be used unless you are aware that they may impact the way your Fi phone switches between carriers.
Carrier Selection
The following options are only available for “Designed for Fi” phones. They will not work on the iPhone or “Compatible with Fi” phones because they are T-Mobile only. See which class of phone you have here.
| ALPHA CODE | DIALER CODE | DESCRIPTION |
| FI AUTO | *#*#342886#*#* | Set carrier selection to automatic. |
| FI NEXT | *#*#346398#*#* | Select Next Carrier |
| FI SPR | *#*#34777#*#* | Select Sprint for 2 hours |
| FI TMO | *#*#34866#*#* | Select T-Mobile 2 hours |
| FI USC | *#*#34872#*#* | Select US Cellular 2 hours |
| FI SIMON | *#*#3474666#*#* | Select Three (UK only) |
Service Codes
| ALPHA CODE | DIALER CODE | DESCRIPTION |
| FIXME | *#*#34963#*#* | Force reactivation |
| FI INFO | *#*#344636#*#* | Get information about the current network. |
| FIBUG | *#*#734284#*#* | Send bug report to Fi engineering (only visible to them for 30 days) |
| INFO | *#*#4636#*#* | Get general phone information. |
| DEBUG | *#*#33284#*#* | Phone Debug Options |
| PRL | *#*#775#*#* | Force download of Preferred Roaming List (Sprint) |
| PRL | *228 | Force download of Preferred Roaming List (US Cellular) |
| FI ROAM | *#*#347626#*#* | Turn on International Roaming |
| SWITCH SIM | *#*#794824746#*#* | Switch to / from eSim. |
extremely useful, thank you so much
total lifesaver. thank you so much for posting this.
From Google Fi – device’s network logs.
The next time you experience this issue, open the phone dialer app on your device and enter *#*#FIBUG#*#* (*#*#34284#*#*). This collects and sends us the information that we need.
Any data you send from your device will only be visible by the Google Fi engineering team. Per our data retention policies, this data automatically deletes after 30 days.
Thanks!
Thanks for the info. Kept getting a Sim 2 not provisioned error. Spoke to Google Support. They gave me a different code to call and that didn’t resolve my issue. This list did with FI Auto and Switch Sim code. Sad when I figured this out more than the hour spent with a tech guy talking down to me on Google Support.