Surprisingly for most people, the phone number (called MSISDN in terms of mobile networks) is not stored on SIM card, which contain only SIM ID, called IMSI (International Mobile Subscriber Identity). By consequence, there is nothing that can be changed locally in a secure way, on SIM level. This is why XCell Stealth Phones can change/manipulate IMSI and cannot directly change phone number.
Hiding Caller ID is something else than changing phone number and depends on your cell phone and mobile network settings. The result is just a Unknown call received by the call recipient. Read more here.
Hiding Caller ID is something else than changing phone number and depends on your cell phone and mobile network settings. The result is just a Unknown call received by the call recipient. Read more here.
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