If the phone says "No SIM" or "Invalid SIM":
This is the most effective fix for "No Service" or "SOS" errors. It wipes saved Wi-Fi passwords and forces the phone to re-authenticate with US Cellular. 228 us cellular not working
If your phone shows bars but you have no data or calls drop immediately, your network settings may be misconfigured. If the phone says "No SIM" or "Invalid
Sometimes carrier settings are pushed via software updates. Sometimes carrier settings are pushed via software updates
The *228 code was designed for older devices to update their Preferred Roaming List (PRL). Modern mobile technology has made this method redundant for several reasons:
If you are trying to activate a new device and *228 is failing, use these official UScellular methods: YouTube·LoFi Alpaca How To FIX Mobile Network Not Available On Android! (2022)
Settings > Software Update (Android) to check for and install any pending carrier or system updates. Reset Network Settings: This will clear saved Wi-Fi passwords and Bluetooth pairings but can resolve deep-seated cellular connectivity issues. Path: Settings > General Management (or System) > Reset > Reset Network Settings. Reseat the SIM Card: Power off the phone, remove the SIM card, ensure it is clean and undamaged, and reinsert it firmly. usims.com +1 How to Get Support If basic troubleshooting fails, you should contact UScellular directly through their modern support channels: Call 611: Dial