I was given a Galaxy Note 2 from a Verizon user and am trying to use it with my carrier, AT&T. I have been successful at calling, using wifi and general texting. The problem comes when I am sent a group text or try to send or receive a picture through text. The guy at the AT&T store tells me this is as good as it's going to get. True or not? Is there something I can do to fix this. They also told me I can ONLY get the web through wifi.