IPhone 4s problem with connection?

I bought an iPhone 4s from someone yesterday and they showed me it working fine with their sim. So I trimmed my sim down and yey it worked. Phew!
Anyway since then I've found that if I turn my phone on I can get onto the app store and download one or two things then for some reason it will just lose connectivity to it and come up with error MSG 'not connected to iTunes'. If I turn my phone off and back on it will work for a few mins again but then the same?!
This never happened in my last phones n I've used samsungs and htcs. Other aspects of online Like search engine and Facebook work fine through the 3G (as we do no have Wi-Fi currently) its just the app store and apparently iTunes although I haven't tried that yet?
Anyone know what the prob could be?
It couldn't be cos I trimmed the sim could it?

How to know if somone read my text message? I have an Iphone?

Is it possible to know when someone reads my text i sent them? I have an IPhone 4.
I Know that i can see when people who have iphones read my text through imessage but what about people without iphone? Is there a way i can get read receipts when someone who dosent have an iphone reads my text?
P.s I don't want to jailbreak my iphone: p

Can I have more than 1 iPhone on my laptop?

I've already got an iPhone and my son just got his today. Can I have more than 1 iPhone on the 1 laptop I've got. If yes could someone please tell me step by step how to do it please. I've got windows 7 on my laptop

Can't send email.smtp port bad?

I have been trying to fix this, searched the web. The best answer I got was the smtp port needs to change. Well, I don't use an email program (Though I downloaded one to try and change it, didn't work. I tried 25, 587 2525, and 465) I'm using "icloud" on a pc. But I can't send an email when I go to hotmail either, or on my iphone. Tried to change the port on my phone but it wouldn't let me.set at 587.

I need help! Please and thank you.

Can't send messages with T mobile Iphone 4s?

So I have an Iphone 4s that is actually locked to AT&T. I tried to unlock it but with no success. So I bought a Gevey Ultra S Sim that can read any carrier's Sim Card and it worked perfectly the first day. But now I'm not being able to send messages although i can receive them. I really need help with this. Thanks
firmware 2.0.12
version 5.1.1
Also someone suggested me to create an AVN. I don't even know what that is.

Free store in Cydia isn't working.what should i do?

I have a jailbroked Iphone thats ios 5.1.1 and i got freestore from cydia. I downloaded an app from the app store and it worked fine. Then i bought something else and it charged me money. And also one i pree the button with the cost on it in the app store it says buy app instead of download, which with freestore it should. Does anyone know how to fix this?

I need a app to download music?

I'm going on a trip tomorrow & don't wanna be bored. What's a good free app to use? I can't use my computer cause it's broke.

Photo iPhone apps like photoshop?

What are some really good Photography apps for iPhone where you can edit pictures really cool? I don't mean ones that just change the hue and where you can crop the pictures. But i've seen pictures where there's like someone standing in hands and edits like that that look like they were done on photoshop but the creator says that all she uses is apps? Anyone have any good ones?