Chosen Solution
This is a factory unlocked Apple iPhone 4. It always shows the error “SIM Failure, invalid sim or no sim card installed.” How can I fix it?
Try going back to your telecom company and have them replace your sim card. That will typically remedy the issue.
Did you tried this solution? it worked fine for my iPhone 4 here http://www.unlockboot.com/2013/06/fix-no…
I am sufyan sarwar and mere pas I phone 4 a332 hai plz help me SIM Failure, invalid SIM or no SIM card installed
I also had the same problem, and I had to get a new iPhone 4.
Well, there are some ways to try. You can try another SIM card. Turning the phone off and on. If it’s a factory unlock, you can do a restore in iTunes, and you won’t lose you factory unlock
when i insert all sim cards it says “invalid sim card”. please i need a help.
