Guarantee deposit The subscriber is required to submit a deposit as security for payment of charges. An additional deposit may be required if either the amount of Services is increased or the credit rating changes.
PIN 2 The PIN code 2 are delivered with the new SIM cards. This code controls access to some of the more advanced features of the phone. The default code is set by the Service Provider, but the subscribers are able to change this code
PIN code (Personal Identification Number) is used for the SIM security and the default one is 0000, after entering the PIN codes wrong 3 times the account will be blocked, to unlock account enter the PUK code. To change the PIN code, please refer to the manual guide of his/her handset
SIM card is actually a tiny computer inserted into the mobile phone. It has a memory (for data and applications), a processor and the ability to interact with the user. The SIM card identifies subscribers to the network and contains a microprocessor chip, which stores unique information about the account, including the phone number, it also stores information about the services that are available to the client as a local subscriber. The SIM card, provided by a local GSM cell phone operator, snaps into the back of a GSM cell phone to make you a local subscriber. The subscribers are not phone dependent, all you need is your own SIM card and almost any GSM phone.