Your phone shows full signal bars but web pages won't load. First, toggle airplane mode on and off — this forces the device to reconnect to the network. If that doesn't help, check your data allowance in the SFR & Moi app. Sometimes the connection drops when you hit your monthly limit or when roaming settings are misconfigured. Go to mobile network settings and make sure data roaming is enabled if you're outside France. Reset network settings as a last resort, but you'll need to re-enter your WiFi passwords afterward.
This happens most often in areas with weak coverage or when switching between cell towers while moving. Check the coverage map on the official website to see if your location has known issues. Indoors, try moving closer to a window. If drops occur even in good coverage zones, remove and reinsert your SIM card — sometimes it loses proper contact with the phone. Update your phone's carrier settings through system updates as well.
The message center number might be incorrect or missing. Go to SMS settings and verify the SMSC number is +33609001390 for SFR. If messages to specific contacts fail, check if you've accidentally blocked them. When all messages fail, your account might have sending restrictions due to unpaid bills. Restart your phone and wait a few minutes before trying again.
Wired connections always beat WiFi for gaming. If you're on WiFi, switch to 5GHz band instead of 2.4GHz — fewer devices use it, meaning less interference. Close background apps that consume bandwidth like streaming services or cloud backups. Contact support to check if your line has QoS settings that prioritize certain traffic types.