I just replaced my iPhone because my last iPhone [also a replacement] was having issues with the touchscreen. This one apparently has issues with the cellular network. At my job, I don't have Wi-Fi, but I always have 2-3 bars, maybe even 1 bar. But it's never at "No Service." Well my iPhone is switching from "No Service" to 3 bars every 5-10 minutes. It's really annoying. I restart the iPhone and have 3 bars, but before I can even finish a song from Spotify, it goes back to No Service. I tried the "scotch tape" trick and it helped give me an extra bar [2-3 instead of 1-2 initially]. Some other places say it may be the sim card. Honestly I don't know, I'm thinking it's the phone, but I can't stand to replace it for the third time in a row.