Straight Talk in fact does use Verizons network, as for your roaming message try *22890 activation line this will update roaming data. - read more
Dialing *228 on my straight talk phone doesnt work, how can i update my roaming? - read more
Please vote if the answer you were given helped you or not, thats the best way to improve our algorithm. You can also submit an answer or search documents about 22890 straight talk update roaming.