Iphone Reception -
: Enable this in Settings > Cellular > Wi-Fi Calling to send traditional SMS (green bubble) texts over a Wi-Fi network. Troubleshooting Poor Reception If your iPhone isn't receiving texts despite having signal: Connect to a satellite with your iPhone - Apple Support
For a more accurate reading of your reception than standard bars, you can use : Open the Phone app. Dial *3001#12345#* and press Call .
If you have Wi-Fi but no cellular reception, you can still send and receive messages:
: You must be outside with a clear view of the sky.
: Works automatically over Wi-Fi for Apple-to-Apple conversations.
: You cannot send photos, videos, or group messages via satellite. Texting Over Wi-Fi