A few weeks ago I introduced you an issue related to the security of iMessage accounts for our iDevices. Practically, in case of theft, loss or sale of an iDevice, the messages sent via iMessage also reach that lost or sold terminal, even if the user used the SIM with his phone number in another terminal. Apple has not acknowledged the existence of the problem, but many users have encountered it they discovered even some methods by which they ensured that the messages sent via iMessage reach the right place.
Macworld can confirm that perhaps the easiest way to ensure that a stolen phone stops receiving iMessages is to remotely wipe the phone, and then call your carrier and instruct them to deactivate your old SIM. The third and final step? Activate a new SIM in your new phone.
Completing those three steps—wiping, deactivating your old SIM, and then activating a new one—ensures that your iMessages will get sent only to you and your iOS devices, and not anywhere else.
The first method involves performing a remote wipe through the Find My iPhone interface in iCloud and deactivating the old SIM, but this procedure involves contacting the operator to change your SIM. If you are not tempted by this option, then there is a much simpler one: setting a PIN for your SIM card. By performing this step, you ensure that all messages reach only the terminal in which you have the SIM card inserted, but you must be careful not to forget the PIN.
Some claim that the simple restore and relogin of the Apple ID in another terminal solves the problem, but not everyone has it that way. In the end, you have three methods by which you can make sure that the messages sent via iMessage reach the right place and all you have to do is choose the one that interests you.
