I'm sure you've search the net, and there is a reason why these sorts of projects don't show up much on websites. Lots of requests though...
Everything posted here in the forum, also shows up when you search google. Perhaps how you found this forum. No matter your intentions, details of such a device could easily be found by anyone, and used for any purpose. We live in some unfortunate times, with terrorists abroad, and students here in the states (high school and college). Personally, I feel a need to stop and thing a long while about each request for long range remotes, or even timers. It's nothing personal, and I hope you find what you need. I not a moderator or anything like that, it's just good sense not to publish such things.
I've never used a cellphone, little concerned about electromagnetic radiation...