Have you ever before experienced the “no SIM error”, “Sim Failure” or “Invalid SIM error” on iPhone 3GS, 4, 4S, and 5? If that’s the case, then you may notice that it gets frustrating with time.
You should consider of all the possible actions to fix the error, such as purchasing a different smartphone, switch your mobile carrier or if practically nothing appears to work, then having your existing iPhone unlocked for once and all.
Methods to Fix iPhone SIM Card error:
But prior to go on considering about using such big steps, here i will discuss a few simple issues that you might consider with iPhone to solve the “no SIM installed error”.
This specific “no SIM” is associated with few things, such as weak signals, bad reader for SIM card or jailbreak. Here is what you need to do if your iPhone does not recognize the SIM.
Damaged SIM Card
There is a probability that the SIM chip has been damaged. To confirm that, test your SIM card in a different iPhone to determine if it is functioning. If it is not, then it really is time for you to visit your carrier for a new SIM card.
SIM Card Not Supported error
The typical SIM failure issue of is associated with locked iPhone, like you can’t use the Verizon SIM on AT&T locked iPhone. And if you wish to do so, you may unlock iPhone with IMEI unlock or some other trusted available alternative for unlocking.
No Signal bars / No Service
Just in case if you have weak or low carrier signals, so iPhone will display that it has no SIM installed. To solve this, start the AirPlane mode for about 20 or 30 seconds then simply reset Network Settings and then remove the SIM from the iPhone, put it back after 10 seconds, switch on iPhone and it’ll do the Network Settings on its own. This may strengthen the signals, if there’s absolutely nothing incorrect at the your carrier.
Downgrading Problem
This issue can also happen if you have downgraded iPhone, most likely some thing might have wrong that it is actually not picking the SIM information now. Due to this, it is actually much better to unlock it with IMEI unlocking and then iPhone is going to be iOS identified phone that might be hooked up to any network you want.
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