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The SMS may also include transaction data, allowing the user to verify that the transaction has not been modified in transmission to the bank. However, the security of this scheme depends on the security of the mobile phone system. In South Africa, where SMS-delivered TAN codes are common, a new attack has appeared: SIM Swap Fraud.
Until 1985, subscribers' telephone numbers in Singapore were five and six digits. Five digits were introduced in 1960s, whereas 5-digit and 6-digit phone numbers were introduced in 1960s as fixed lines grew, but in that year, these changed to seven digits as the introduction of new towns arose (Tampines, Jurong East, Bukit Batok, Yishun and Hougang) and a large number of new numbers were required.
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.
Premium rate numbers start with 1900; premium rate SMS have 4 digits starting with 4,5,6,7,8 and the 2nd digit decides the price (except 1400 - 1409 with variable prices from 3000-18000 VND per sms, reserved for charity and 156, 5656, 1414 which are free).
The RRN has since replaced the number with identification SMS (via phone owners' information), public key certificate (requiring a visit to a bank, since PKC is stored in user's PC or personal device unlike other countries), and i-PIN, Internet Personal Identification Number, which may be obtained via registration of RRN with a governmental site.
For example, an interior decorator might license the telephone number 1-800-724-6837, but advertise it as the more memorable phoneword "1-800-PAINTER". Sometimes businesses advertise a number with a mnemonic word having more letters than there are digits in the phone number.