Mobile service provider without ties, according to Danny Dyer? (5)

I believe the answer is:

three

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'mobile' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for three that I've seen before include "Prime number" , "trilogy" , "Number of Furies or Norns" , "Bears or blind mice" , "Number of Dumas's musketeers" .)

I've seen this clue in The Independent.

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