Fixes up local mobile phone numbers to a uniform text format.
fix_mobile(x)The updated vector, usually the column of a data frame.
A character vector of numerical strings.
This format is specific to that used in a given location - for
now the function is useful only for Nigeria mobile numbers, which come in
the format expressed by the regex pattern "^0[7-9][0-1][0-9]{8}$".
fix_mobile("803-123-4567") # Adds leading '0" and removes separators
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