I have exclusive access to quite a range of Pay Per Call campaigns in the US. I think they could work well with email here.
Most of them pay after someone calls the number on the lander and stays on the phone for 60 seconds to 2 minutes and presses the right buttons.
Let me know
If its make money related you can always try me out, I can't guarantee any results (and anyone doing so shouldn't be trusted in my opinion). Ill do my best to help you in any way I can.
I'll send you some landers via DM and I'm sure we can do some tests. I'll be in touch soon :)