The most important thing is to make sure you get switched to a 4g data plan. Just putting your sim card in the phone will not make the data work!!!!
You do NOT need a new sim card, though AT&T has released a new sim card that isnt 3g/4g specific. (it looks cool though)
Make sure if you are coming from a non android smart phone that you back up your contacts online (with google preferably)
if you are coming from a non smart phone, make sure your contacts are saved to the SIM
enjoy the phone guys!
You do NOT need a new sim card, though AT&T has released a new sim card that isnt 3g/4g specific. (it looks cool though)
Make sure if you are coming from a non android smart phone that you back up your contacts online (with google preferably)
if you are coming from a non smart phone, make sure your contacts are saved to the SIM
enjoy the phone guys!