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+---- Thread: ATT Windows Mobile phone 640 LTE keeps saying sim erro (/showthread.php?tid=5660789)
ATT Windows Mobile phone 640 LTE keeps saying sim erro - Orangesuit - Jul 2, 2017
Hey guys I keep having an error on my phone. It happened after I tried to upgrade to Windows Mobile 10. After the phone stays on for 5 mintutes it says sim error, sim is invalid. But the sim card works til five or so minutes. Tried a different sim card, same issue. Can anyone please help me out, it's not even my phone I just tried upgrading someone's phone for them following Microsoft's steps... No good deed goes unpunished
* - Dr.Schere - Jul 12, 2017
First you can try to make a hard reset and have a look at the sim security
If the problem still remains you can try to downgrade to an earlier firmware
* - Orangesuit - Jul 13, 2017
I found out what it is. My friend is in prison therefore he couldn't go to the store to get it flashed. But he didn't have a windows mobile battery. They had to solder a lg battery in. There was a bad connectio . And its Fixed now with a fresh solder