I had been using iPhone 4S for years and didn't update the iOS at all for years since I bought it. The whole thing happened smoothly until I updated the iOS last week through Wifi. Everything becomes so lagged. I have tried to erase and restore the device to factory default but it is just useless. It is still lagged. There are only less than 3GB of total data in my iPhone 4S 16G.
Can I do anything or is it the high time for me to shift to the newest iPhone
Can I do anything or is it the high time for me to shift to the newest iPhone