A number to help get connected with God? I called in, desperate (8,4)

I believe the answer is:

dialling code

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'a number to help get connected' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'god? i called in desperate' is the wordplay.
'desperate' is an anagram indicator (a desperate or pathetic spelling).
'god'+'i'+'called'+'in'='godicalledin'
'godicalledin' with letters rearranged gives 'DIALLING CODE'.

'with' is the link.

Can you help me to learn more?

(Another definition for dialling code that I've seen is " which you need for mobile".)

I've seen this clue in The Independent.

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