The important thing to remember - do not to enter the PIN code more than twice if you are unsure of its combination (it will result in blocking the CITYCALL I8550 by the SIM. Using a hard reset operation here will not help. The only thing you can do is contact the customer service of your provider and ask for a PUK code to unblock your CITYCALL I8550.
15 Sep 2023
13 Sep 2023