I'm about to sell my samsung G810 phone and want to delete all messages, except it seems I can not do one at a time. Do you know another solution faster because I have more than 200 sms to erase. I tried resetting factory settings but it did not erase the sms message. I hope there's a solution.
Well now, after having spent hours deleting my messages one by one, I went to my contacts. And then a revelation. To delete multiple messages or multiple contacts at once, you have to "mark" what we want to erase, and "delete". It's simple, and obviously I understood afterwards. At least it will for others.