welcome to the forums!!!!!!!!
server? not sure what you mean. if you are talking about the internet then the evo has wifi capabilities. if you are talking network signals then it works only with cdma technology and the phone is porgrammed to be on sprint. you can root the phone and then program it so that it can be used on verizon's towers if you like. but be warned that if you do, you will run the risk of sprint giving you the boot for doing so.