So ive had my galaxy s 2 since it came out and its been running smooth, but every now and then when im texting someone i dont get a reply back from them. Sometimes i think they forget, but i ask them if they sent a text and they say yeah. Also i had a issue where my friend tried calling me and sending texts, but i never received any notifications about it. She said when she called me instead of ringing it said that i was currently unavailable. Does this have anything to do with the phone or the network im kinda curious cuz i gotta get my game on 
