i have an htc vivid, just switched my sim, here are the settings i finaaly got to work, i have messaging and internet..
1.APN Name: Straight Talk
2.APN: tfdata
3.Port: 80
4.MMSC: http://mms-tf.net
5.MMS Proxy: mms3.tracfone.com
6.MMS Port: 80
7.Delete the current APN from your phone. if...