Carlos wants to know if his iPhone can pair to multiple bluetooth devices. Leo says yes! It's been a standard capability for awhile in smartphones now. Leo also recommends over the ear bluetooth headphones.
Motorola makes great wireless headphones, as does LG. The Motorola S10HD are about $40, and they go around the neck and house the batteries for longer battery life. He'll also want headphones that support the high quality stereo profile called 'A2DP.'