Where are you from? You should check with local providers. All networks should be able to be supported by the phone, but htey maybe locked to a certain provider depending on where you buy.
For example.. In the UK it will work on Vodafone, Orange, O2 etc.. but if I buy it from 02 then it will be locked to 02.
If you buy in America on Sprint, you can only use it on Sprint unless it is sim unlocked..
It should pick up any network, anywhere.. just like any other phone. It may just be provider locked.