The 0121 dialling code covers Birmingham and the surrounding area.
Number 0121 423 5640 is potentially valid.
Ofcom records show that numbers starting 0121423 are allocated to BT. Note that due to number portability if an individual number has moved to a different operator this information is not publicly available.
Ofcom's last recorded change for this number range was July 1994.
The correct way to write number beginning 0121 is in the format 0121 xxx xxxx
The local number (the part of the number after the dialling code) is 7 digits long
When calling from a land line, calls to 0121 numbers can cost up to 10p per minute, dependent on the
time of day, and there is usually also a call set-up fee.
When calling from mobile phones, calls to
these numbers cost between 10p and 40p per minute.
Most land line operators offer inclusive call packages which allow calls free at certain times of the day, or at all times, and most mobile companies include free any-time minutes in the monthly contract payment, or a bundle of minutes for a reduced cost in the form of a top-up credit.
Codes near to the 0121 area code: