Question, not sure where to ask it.

I'm getting a new phone somtime this week and I just want to make sure I don't do anything wrong. I have T-Mobile right now and I have a sidekick so I have a sim card already. If I order a phone from a site that is compatable with T-Mobile and I just put my sim card in it will I be fine? Do I have to tell T-Mobile that I am using a new phone?

Sorry if this has been asked, but I didn't really know what to put in the search to search for the answer to the question. I just don't want to be stuck paying for a $300 phone from a site and then not being able to use it for whatever reason, or be able to use it and then get in trouble with T-Mobile.

Oh and, do you guys recommend any sites for purchasing unlocked phone? Particularly the SE k750... thanks.
 
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