Hi, I have a problem with a iPhone 6 Plus. On a scale that goes from -140 to -40 (best signal possible is -40), the phone shows -65 dB. This is a strong signal. But the signal-bars doesn't show up. Cellular data works fine, but SMS and calls doesn't work. If I reinsert the SIM, it shows the bars, but as soon as I try to call from the phone, call to the phone, or send a text message, the bars dissapear. I've tried to connect to 2G, 3G and 4G. I've tried to reset network-settings, and tried another SIM-card. The phone is not jailbreaked. I've also tried to set up the phone as new. Someone that have any tips for what I can try next? Thanks in advance!