Phone companies in the UK promise to donate 5% of your monthly bill for calls made from a Motorola Red phone, using any SIM card. How do phone companies know you are using this phone?
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It's entirely possible that the phone itself has identification, which can be read by the sim card.
Probably a similar system as websites being able to know what version of windows you're running and which browser.
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all the phones have IMEI number that u can get by dialing *#06# send in ur phone
even u can know if had the IMEI in this page, www.numberingplans.com n appear the phone that ur using
so when u turn on ur phone all the cell tower detect the SIM n IMEI, so the company check the database n then get the phone ur using....
hope this solve ur question
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