My cellphone has been loosing service constantly for a while now. my cell phone also says its sim card is invalid, its extremely frustrating. I keep having to restart my phone for the service or for my phone to work again.
Hi Billie-Anne, There was an Apple article on the issue with iPhone: https://support.apple.com/en-ca/HT201420 As you have restarted your phone several time to make it work, I think the problem could be from the SIM or the iPhone, I would try the SIM in another phone or replace the SIM card. If the SIM doesn't work then it could be issues with your iPhone.