a while ago i tried making fm transmitters fit inside the guitar to play through any am/fm radio , they worked , you could use any radio , even in cars , just by finding the freq . but sound quality was not there , i tried beefing them up a bit , and fried about 13 units . then i made a large model in a separate box ,, only to find out china has kits and units (radio stations ) about a 3rd of what it cost me to make ..lol . not to mention local broadcasting regulations here . so it made cords look cooler again ;-)
Great, another thing for AT&T to take over.
How would you stop unwanted calls while playing?
I'd be afraid that I'd get put on the "Do Not Play List".
there are a ton of headphone-jack Bluetooth transmitters for your phone and mp3 players, and they are cheap, and a 1/4in to 3.5mm adapter is also cheap.
I used to run the sound board at church. They had some cheap Nady wireless mics that were real bad with interference problems with other equipment, but the more expensive brand wireless mics worked well. Would be interesting to see how well this works.