Devices : iphone 5 (at&t), verizon, sprint. solution 1:-this is a temporary issue. reboot your iphone or ipad to fix this issue. press and hold sleep/wake button and home button together until apple logo appears.. Honestly, not only old iphone devices users will complain about this "invalid sim" issue. or iphone says no sim card installed when there is one. as a matter of facts, it's a headache that makes a nuisance to users of all models such as iphone 5/5s, iphone 6/6 plus, iphone 6s/6s plus, even the. If you get a pop-up on your iphone 6 telling you no sim card is installed, or you see no sim in the top left corner instead of your signal, this can be caused by either a software or hardware issue. here are some steps you can take to try to solve this problem:.
When the sim card is not clean and has a lot of dust particles, the no sim card installed problem comes in iphone. you can fix it easily. put out the sim card from your iphone.. If your iphone still says it has no sim, your sim card could have a hardware problem. one way to test this is by inserting a sim card from another cell phone. make sure to use the correct size – standard, microsim, or nanosim – for your phone.. The sun is shining, the birds are chirping, and all’s well with the world, until you notice that “no sim” has replaced your mobile carrier’s name in the upper left-hand corner of your iphone’s display. you didn’t take the sim card out of your iphone, and now you can’t make phone calls, send or receive text messages, or use mobile data..
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