Hello, this is my first post so thanks in advance & greetings to everybody. The tagline says it all really. I have the dual sim version of the 918. Two weeks ago i switched the sims so i could get a good internet deal on one of my sim cards. so i put my main sim into slot two. I then noticed when people called me on this sim the call would drop after a few seconds or within a minute. When it is moved back to slot one, no issues. I currently testing to ascertain if the same happens to the other sim in slot two. I did try to unlock the phone a few weeks ago so i'm wondering if this was a cause? Hope it isn't a hardware issue.