T-mobile iphone 3gs made to work with att?

This iPhone 3gs was bought in Germany, unlocked, for T-Mobile service. It came unlocked special for overseas military. How can I get it to work for AT&T… I popped my AT&T sim card in, that's not working. I'm sure there's some setting I'm missing…

How to unlock my Globe iPhone 4?

I'm having a hradt time unlocking my iPhone 4 Globe Philippines. I bought it in the US and but now I'm outside the US. I need help to unlock mu iPhone in order to use it in my country!

Do i need to order a IPhone 5?

Okay so my daughter wants a iPhone 5 for her 16th birthday. I was wondering do I have to order it or can I go right in the stores and get it?

Does an iPhone work well with T-mobile?

I'm mainly concerned with the texting.
When people text iPhone to iPhone, a little speech bubble shows up letting the other person know that the other one is typing a message.
Will this feature still work between a Verizon iPhone and a T-mobile iphone?

Problems installing firmware?

I have an iPhone 4 running 4.0. I want to upgrade it to 5.1.1. But I keep getting error code 1601. I've used iREB already and still no luck. Any other suggestions on installing this firmware.

Does a group message cost extra on an iPhone?

So I have been group messaging a lot (messaging like 2 people in the same conversation/text). Does that cost extra or count as a picture message? I really need to know. I just got my new iPhone 4S and I'm just not sure. I don't want to get any extra charges. I have Verizon if that matters!

If I hook up my iPhone to the computer, can I scan it for malware?

I've never had a problem with email accounts, spam, etc and all the sudden one of my email addresses (that's connected on my phone) had a changed password and is now constantly getting spam!
I'm noticing another email account (also connected) is getting bombarded with spam emails.
I think it's my iPhone because I did a search for something on safari and started getting spam messages about my search!

I'm partially afraid to connect it to my comp because if I do have something I don't want to spread it to my computer, but if I run a scanner would it scan my phone too?

Added (1). I would get spam emails for using google on my phone?