Why can't I send text messages when Android phones are loaded with letters?

The SMS function of Android phone can't be used. Solution: 1, test in another area or time period with good signal; 2. Check whether the phone bill of SIM card is sufficient or try to replace the SIM card; 3. Enter Settings-Information-SMS Center Number to check whether the SMS Center number is correct; 4. Go to Settings-More Settings-Applications-All -Android

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WebView, click Uninstall or Update, then restart the phone and try again; 5. Go to phone settings-More settings-Restore factory settings-Restore all settings (without deleting any data of the phone). If all the above methods fail, it is recommended to contact the official after-sales service of mobile phones. If you need to set the SMS center number, you can reply: XX SMS center number setting method (for example, Apple SMS center number setting method/Huawei SMS center number setting method).