Question: how to fix your iphone 7 when it says no service?
Answer: Check your coverage area. Make sure that you're in an area with cellular network coverage. ... 
Restart your iPhone or iPad. Restart your device. ... 
Check for a Carrier Settings update. ... 
Take out the SIM card. ... 
Reset your Network Settings. ... 
Update your iPhone or iPad. ... 
Contact your carrier. ... 
Get more help.