I brought an iPhone 4S of a friend which was on EE but also had a cracked screen.
I was using the phone whilst it was cracked until it cracked more.
I thought about ordering a screen and so I did. (I ordered it of eBay and it works and fitted perfectly as people say its a load of junk)
I asked a local phone shop to do it and they were charging me £30 labour fees and so were others at the same price range.
Then I replaced it myself and I did a pretty good job until I turned it on it will say Searching, No Service or Invalid Sim.
I had a look on Google, YouTube and other sites and I've done nearly everything they've said to fix it.
So far I have done a complete reset, checked the antenna and also replaced them, I've done a network settings reset and there is no difference.
As ASDA MOBILE are powered by EE I inserted that into the phone it'll say the same thing until I go to settings carrier and uncheck the automatic selection which makes it manual then it will search and come up with ASDA MOBILE when I check it, it will have a tick next to it but I still can't make calls.
I know the phone is not blocked because I was using it myself before I changed the screen.
Can someone please help me as I am going abroad in a few weeks and need the phone working so I can get it unlocked.