What number does imessage use?

I found an iphone today so i took it home and master reset it. When i reset it i never took out the sim card so when it booted up i took out the card. I'm using the thing like normal now and tried imessaging one of my friends. How is this working with no sim card in it? I have ios 7

Iphone 4s or 5? 64gb versions?

Hi

Could anyone please tell if there's much difference between the 4s and 5 in performance?

64 gb 4s can be found for £250 and 64gb 5 can be found for like £390!

I know i'm well behind on phones but my galaxy s3 is playing up loads and I can't afford to get the 5s!

I also need a large storage version hence why I can't afford 5s which is £709!

Anyone know of anywhere good to buy these phones from with out contract?

IPhone 4 problem could anyone

Well the past few days I've been noticing my battery going quicker than usual and the other day I was playing a game on there and then all of a sudden my screen went black I plugged my charger in and my screen still remained black but it just continuously made the charging noise the noise it make when ya put the charger in over and over, could this be my battery that's conked out or something else any answers will be grateful thanks in advance

Activation error With ios 7

My friend downloaded iOS7 beta version before the official one and it worked just fine now, it says we need a iphone developers account to activate the phone but i want to save $100,
i have tried to restore the phone by downloading the official ios7 and holding down shift and clicking on 'restore' it doesn't work, it just says 'The Phone could not be restored because the firmware file is not compatible.' Please can someone suggest something to fix this, Many Thanks

IOS 7 firmware not compatible, but downloaded all different kinds of ipsw?

Earlier today my phone said activation required. I went on itunes and it said my software has expired. My brother told me that I need to download an ipsw and then go into itunes and hold shift and click on check for update then and select the ipsw file. Only I have downloaded the ipsw for iOS 6.1.3 or whatever to try and restore it back to that and have tried the ipsw for iOS 7 and none of them have worked. They all keep saying firmware not compatible. I have tried downloading them for the iPhone 4, iPhone 4 GSM and the CDMA and still none of them are working. I'm ready to just restore this phone because it's driving me up the wall. I have tried different sites and different ipsws and it's just not working.

IPhone problems what should I do?

One of my friends got the iOS 7 from pirate bay, and now my phone won't work something with activation error. Any ideas on what to do I can't restore or anything.