How does virgin sim card know if the phone is blocked/ blacklisted?
I am hoping someone could walk me through the steps a sim cards takes once it has been inserted in a phone.
Specifically I am looking for answers to these questions below too.
(1) Once simcard is in phone how does it decide if it is eligible to "speak" to handset?
(2) How does a sim card know if a phone IMEI has been blacklisted?
(3) If a phone's IMEI number doesn't appear on the virgin media database will the sim card and phone be incompatible?
I recently purchased a phone to use with my pay monthly contract until I can get an upgrade. The phone is unlocked to any network and indeed works with every other UK network provider apart from Virgin. I am trying to understand the mechanics of the simcard/ handset relationship to determine if virgin sims do some part of the prcess slightly different which prevents the two from working.
All advice/ info greatly appreciated. I'm determined to get to the bottom of this as I am intrigued with the problem... not to mention I love the phone and would hate to have to give it away/ or change provider).
Re: How does virgin sim card know if the phone is blocked/ blacklisted?
Every SIM card has unique identifiers that the network recognises. So a SIM that has been either blocked off the network, or has expired (PAYG with no top up for x number of months) will NOT allow a connection to be made, no matter what phone you put it in.
So you can check easily, pop it into a different unlocked phone. If it doesn't work, its the SIM card.
If the phone will connect to other UK networks with a different SIM card in it (as you have stated), its likely the SIM card at fault, not the IMEI being blocked.