Does a unlocked iphone on the tmobile network work just as good as a iphone on the at&t network?

I heard that unlocked iphones with a tmobile network have trouble connecting to youtube or websites? So just wandering if the unlocked iphone is any different from a iphone from at%26amp;t.|||you can only get internet if you have a wifi connections the voicemail visual doesnt work,its not 3g other then that its the same|||the only difference is that you wont have a data plan so youll have to look for wifi when you want to use the internet. other then that it will work fine.|||There have been some problems including gps doesn't work but that has been fixed. You can still use the internet if you buy a network plan for tmobile. So in other words no there is no difference.