Long before the PC idea caught on, we had FAX and Telex machines, over which systems I'd managed to project a card or word, etc. I used this many times on clients during a conversation in which, for an example, a card reveal when seemingly wrong only for them to get an URGENT FAX revealing exactly the card in question, sent to them via my Spirit Guide or whatever.
In experimenting and actually using such elements off and on over the years I've found them to be "neat" and/or "cool" in the mind of magic buffs but not so much the average layperson. Every time I've presented this sort of demonstration the comment is "Cute Trick" or something similar. It might get a chuckle and it could get you a job, but it is not anything ground breaking.
Currently there are a myriad of effects being developed specifically for use of an iPod, Cell Phone, etc. and yet material introduced just two or three years ago is already obsolete and quite literally, dead in that it cannot be adapted to the newer technologies. This is a continual threat when it comes to technologically dependent magic such as your card trick. It is something we must always bear in mind when we invest long hours playing around with such a concept and whether or not you will see a pay-off just a couple of years down the road or if you will hear snickers from the audience because you are using out-dated equipment?
As with all magic, you have to figure out what your goal is and what you want to audience to experience or associate with.
I hate to break it to you, but few of us are able to pull off our own best made plans without help; we always need feedback and we MUST take most of it to heart. That's how we learn and eventually begin creating magic that has quality to it.
Think about it all, you'll figure it out.
