Problem WiFi while iPhone 4S is in screen lock
I bought an iPhone last week, and I've realized that when the iPhone screen is locked wifi disconnects.
If I have also connected 3G, the 3G connection appears, and if I have not connected 3G is none connection.
And in milliseconds reappears wifi icon again.
Is it normal?
Thank you very much.
*I heard something about it, but it happened in old iPhones.
iPhone 4S, iOS 6