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Some of the cell numbers American does care about (4,5)

Ross

I believe the answer is:

area codes

'some of the cell numbers' is the definition.

'american does care about' is the wordplay.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'about' indicates an anagram.
'does'+'care'='doescare'
'doescare' anagrammed gives 'reacodes'.
'a'+'reacodes'='AREA CODES'

(Another definition for area codes that I've seen is " Phone numbers identifying call destinations".)

I've seen this clue in The Guardian.
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