Revision to iPhone Invalid or No SIM
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| [title|iPhone Invalid or No SIM] | |
| * Update the operating system to the most recent version. | |
| * To rule out software altogether, reset the device. In cases of potential operating system fault, it is best to do this via a PC with iTunes or a Mac to be sure a fresh copy is installed. | |
| - | ** ***Note:*** Proceed with caution. |
| + | ** ***Note:*** Proceed with caution. This could lead to an inability to activate your phone if the issue is hardware related. This means you would not be able to complete device setup after the restore. Be advised this is a possibility. |
| == Faulty SIM slot == | |
To undo the changes made by this version, click 'Revert Changes.' This will automatically restore the previous version of this guide.