I had the sg2 flashed from Boost to Straight Talk in November. Had existing Straight Talk account. Phone flasher transferred my # from old phone to newly flashed sg2. Texting was wonky. Got tired of texts in Russian, just transferred # back to original phone 2 weeks ago. Got on this forum Saturday, I believe, wanted to try your suggestion of clearing texting app cache. Needed sg2 activated to do that. Called Straight Talk Sat., had them reactivate sg2 (which they think is a flip phone) MEI for donor flip phone is listed as an inactive phone on my Straight talk summary page. Was able to activate it that way, I don't have the donor phone, since the sg2 was reactivated Saturday, mobile data doesn't work. (I got spoiled using the sg2-the galaxy proclaim has android 2.3, a small screen and slow processor)