Whats the deal with iFraming?

So do not alot of networks allow iFraming? is this a widespread thing? are there SOME networks that allow iFraming? if so, could you name a few?

Im looking for Mobile offers. i have a site that gets 40k+ hits and before i had a regular lead form into my system and 50% of the visitors FILLED OUT MY FORM ( it had like 8 fields + Phone Number).

So if you have any great ideas for a mobile iFrame offer and a network that allows that.

let me know!

Thanks all!