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iMore Question I have an iPhone 5s, Its carrier locked and i have been using R Sim (gevey Sim), It was working fine untill yesterday I updated it onto iOS 7.1..!
Now it says sim not valid..!
Any idea how can i get back on to iOS 7.0.6?
Or how I can activate the Gevey sim again?
Where did you buy the first one that worked until the update? 7.0.6. was unsigned by Apple an hour after 7.1 was released preventing you from going back so I would contact the carrier first and see if they can or will unlock it. That is your easiest option. You can also contact where you got your gevy sim just in case and find out if they have one to support 7.1 as a backup. Good luck.