Marketing via mobiles possibly exhausted the Guides (4-3)

I believe the answer is:

tele-ads

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'marketing via mobiles' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'exhausted the guides' is the wordplay.
'exhausted' suggests removing the centre (the word is emptied out or exhausted).
'guides' becomes 'leads' ('lead' can be a synonym of 'guide').
'the' with its middle removed is 'te'.
'te'+'leads'='TELE-ADS'

'possibly' acts as a link.

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