Can I use my iphone with tmobile?

Okay I went through almost every video on youtube and the only thing I could do is unlock my iphone without a sim card.
I have an iphone 4 running on ios 6.1 or something like that.whatever.
anyways I was just wondering since tmobile has iphones now can I just ask them to give me a micro sim card for my iphone? Or does it not work that way.
because jailbreaking takes too much time and I couldn't take it anymore.
and everytime I did that redsnow *** like run as adminsitrator, the decrypt kernel message always shows up.
anyway, yeah can I just go to the people and ask them to set up my iphone or what?

Added (1). If I do end up taking it to tmobile, what would the cost be?
I already have unlimited internet and that 4g stuff but is there anything else i'd have to pay for?

How to get IOS7 on my iPhone?

Someone told me that if you go on www.apple.com and you sign up to become a developer you can get IOS7.Is that true? And if so how do you do it? I know it's coming out this fall but I want it now haha

How Limited is the iPhone 5?

Can anybody with an iPhone 5 go to this website: www.education2020.com, and see how well it works on the iPhone 5? I'm wondering because (education2020.com) is where I go to to do my online school, and before I buy the iPhone 5, I want to know if I'd be able to use it to do my online school work. For my online school work, I pretty much just watch lectures and take notes.

Can you dry out an iphone 4s with rice?

I've had my iphone for a year, i've always taken care of it and the worst thing happened today at work. I dropped it in a bucket of water. I don't think it was in there not even.001 seconds. It was working for literally two minutes now it just won't come back on. So does putting it in rice help? Has anyone had any luck or success with their iphone?

Touch screen unresponsive on iPhone 5?

My iPhone 5's touchscreen is not responding at all. I tried to reboot it already and took off screen protectors.might it have water in it because a few drops of water seeped through the waterproof case when i dropped it into the deep end of the pool. Do i need to take it to apple or is it something stupidly simple?

My iphone 4 never gets service?

My iPhone 4 never gets any service anywhere, sometimes it might pick up 2-3 bars outside but then it goes away instantly, i never get it in my house and my area has good coverage, i've tried new microsim, resetting the phone, hard resets, airplane mode on/off, nothing works, i think it might be the aerial that is faulty but i don't know, help would be much appreciated.

Should i be embarrassed because i don't have an iphone?

I have like a phone that looks like a blackberry. Its from metro pcs.almost all my friends have iphones but we can't afford one and i understand that. My phone works fine i can text call and i have internet but should i be embarrassed for not having an iphone?

Laptop won't detect iPhone but will detect other USBs?

I have been having issues with this for so long. I have contacted Apple and they couldn't figure out the issue and now I'm reaching out to you guys hoping SOMEONE will be able to help. It use to work perfectly and stopped suddenly. I have no idea what the issue is, but I know it's with my computer and not my phone because I've tried other iPhones and they weren't detected either.

I'm using a NE51B Gateway laptop with Windows 8, trying to connect an iPhone 4.

Added (1). The phone DOES charge when I plug it in. The issue is that it doesn't appear under my devices and I can't view it on iTunes. (I want to add music to it)

such as the usb itself is broken - The USB works on other computers.

could try rebooting you pc to see if it do any help in locating your phone's drive - I've done this MANY times.

Or maybe that the usb no longer working - Other USB stuff does work. I've tried it with my PS3 controller and other devices that use a USB. It just won't detect my phone for some reason.

Added (2). I have the latest version of iTunes. I have tried uninstalling it and reinstalling but nothing.