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The 0121 dialling code covers Birmingham and the surrounding area.
Number 0121 448 6845 is potentially valid.
Ofcom records show that numbers starting 0121448 are allocated to TalkTalk Communications Limited. 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 October 2003.
Phone numbers beginning 0121 are geographic numbers.