I am using an iPhone 6 on UK network EE. I am currently traveling in Nigeria. Everything was going fine, making and receiving calls, but suddenly out of the blue I stopped picking up local networks. I have also lost the 'Carrier' settings tab in the settings app (see attached image.) The phone can still connect to wifi but not GSM. I just get searching in the top left. I have restored from a back up (a month old one in my iTunes library). The internet is not good enough where I am to re-download the iOS. Tried estimated time was about 432 days!. Any thoughts? Will it come back to life when I land in the UK?