In Miami, FL 33184, we keep roaming on our phones when normally we don't in this neighborhood. It is with 4 different types of phones. It has been happening for at least 3 days now. Is there anything wrong with the signal around here? With the Samsung Nexus S 4G, it keeps trying to receive a picture through text message and the data is saying its roaming and won't download the picture. Is there anything that can be done? Please help. Thank you!