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In mainland China, mobile phone numbers have eleven digits in the format 1xx-XXXX-XXXX (except for 140–144, which are 13-digit IoT numbers), in which the first three digits (13x to 19x) designate the mobile phone service provider. Before GSM, mobile phones had 6-digit (later upgraded to 7-digit) numbers starting with nine.
A virtual base transceiver station (VBTS) [5] is a device for identifying the temporary mobile subscriber identity (TMSI), international mobile subscriber identity (IMSI) of a nearby GSM mobile phone and intercepting its calls, some are even advanced enough to detect the international mobile equipment identity (IMEI).
The phone number is needed in order to send an SMS-code at log in or a temporary password if the user forgets the password. Transparency, correction and deletion [ edit ]
A telephone number serves as an address for switching telephone calls using a system of destination code routing. [1] Telephone numbers are entered or dialed by a calling party on the originating telephone set, which transmits the sequence of digits in the process of signaling to a telephone exchange.
PSTN Service Numbers 20XXX – 29XXX: PSTN 30XXX – 39XXX: PSTN 40XXX – 49XXX: PSTN 50XXX – 59XXX: Mobile, GSM: 60XXX – 69XXX: Mobile, GSM 70XXX – 79XXX:
Liechtenstein Numbering Plan (ITU-T E.164) Leading digit(s) Number of digits Services 1 3-4 Access codes 2 7 Fixed-line services 3 7 Fixed-line services
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