I have a new obsession, it's called riding bikes! I have a question regarding phone use.

I have a history of seizures in my life, so long solo rides worry my wife to the point that it really is not worth riding (she needs to be able to get in touch with me). As far as you all know, are there any earpieces wired or bluetooth that stay in place fairly well while sweaty. I use an iPhone 4, and the wired headphones are okay, but you are left with another earbud dangling and the earbud doesnt stay in place very well when I get sweaty. Plus I dont like that it looks like I'm listening to music, thusly being unsafe while riding.

Any ideas?