Normally a phone will keep the text msg in internal memory. So once it's gone it's removed foreever. However, there may be a sliver of hope. My phone will save mine to the SD card. Deleting a file off a SD card is just like removing it from a hard drive. It can still be recovered using recovery software as long as nothing else has been written to it. The problem however is that most txt msg's aren't stored as a single file, but in a larger mass file.. all depends on your phone, but worth a shot to pull the sd card and try it if you have one.
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