Do debt collectors ring off of a mobile phone number?

I live in the UK.

My SO has a fine he hasn't paid off and was contacted by a debt collector. They had told him they sent a letter to his address (his old address) and what the fine was for how much he had to pay ect..

The only dogey thing as that they rang of a moblie number asking for payment over the phone.

No payment plan was offered, They rang his moblie which I know if normal thanks. :-)

Has anyone else been contracted by a debt collector was it from a mobile number?

I know its not pregnacy related sorry

TIA

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