I recently upgraded my UK O2 provided iPhone to a 3G model, and we bought an O2 pay-monthly SIM to put in my “old” iPhone that was freed up as a result of the upgrade.
However, while it would work sometimes, at other times it would display “No SIM” at the top left, and pop up a message saying “No SIM card is inserted”. We would restart it, and it would be fine for a short while, and then “No SIM” again.
This was very annoying, and I spent a long time trying to figure out what the problem was. Two restores, a lot of removal and re-insertion of the SIM card, and a certain amount of Googling did not provide a solution.
The answer turned out to be as follows. On the phone, I went into the Settings applet, then:
General -> Reset -> Reset Network Settings
This has completely cured the “No SIM” problem, and it’s run very smoothly ever since.
{ 16 comments… read them below or add one }
DARN! I left comment in wrong spot. Okay, let’s try again. Glad to see that the iPhone drove you to blog again!!!
Thanks Jen – I have to say it felt good. Going to try and do it again soon
This did NOT help me at all. I even tried resetting all.
Great, i was having this problem, this solve it nicely. Greets, and thanks
I dropped my iphone down the sink and after getting it out I tearfully put it in the airing cupboard for a week as it went mad – amazingly it switched on 7 days later. However it came up with ‘No sim’ etc. and just before I went down the shop to buy another I came across this great post! Thanks very much my once random water damaged no sim iphone is back and working great!
This help worked perfectly. Thank you. Vasif
didnt help my no sim problem
Thank you very helpful!
i am buying an i phone off ebay can i use my current 02 sim or do i need something else????
Is there a thing as an 3g sim card or am i being a wally
hope some one can help
Thanks will try this as have exactly same problem
hey guys. I had the same problem after i installed Os 3.0. I restored the phone back to 1.1.4 (its a 2G) and then jailbroke it. After that i cleaned out the network settings and after 2 reboots it worked perfectly fine.
Cheers mate, this has helped a lot.
Such a simple solution, was really getting on my nerves though!
thanks for the update i will try it..
GREAT solution.excellent. I tried and it does work straightaway I got rid of my ‘NO SIM’ problem.Sooooo grateful.Thanks for sharing.
Thank you. It looks like your suggestion has solved the problem. I will let you know if that changes. Best, J
dude thanks– you are the best^)^