Phone hacked? blank outgoing texts that i didnt make?

my phone (Samsung galaxy j7) has several outgoing text messages that I didn't make that are all blank from what I can see. I assume my phone has been hacked, im not sure what to make of it though. Any specific advice or information would be helpful. Recently someone tried to scam me on Craigslist, but I... show more my phone (Samsung galaxy j7) has several outgoing text messages that I didn't make that are all blank from what I can see. I assume my phone has been hacked, im not sure what to make of it though.

Any specific advice or information would be helpful. Recently someone tried to scam me on Craigslist, but I don't know if that's involved.
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