Any bluetooth headset will work with your iphone. The bluetooth protocol is standardized. Now to find one that works well is an entirely different issue.
The Jawbone era is a favorite among many, but Jawbone devices (and other manufacturers) have a tendency to stop working properly around a year. Also the Jawbone background noise filter may not work with your voice. For me it would filter my voice (moderately low) unless I spoke extremely loud. This IS insuring that the rubber nub is touching my face.
I have had the greatest success with the Motorola HX550 but again it stopped functioning properly around a year.
I have tried the Plantronics: Voyager Pro, 925, M55, M155, M165 (marque 2) / Jawbone: Original, Icon, Era,
Motorola HX550, and various Samsung and LG units. Plus many more that I can't remember; the HX550 worked the best for me and my callers. (I used mine all day in and out of a car (Honda Fit). I am now looking to for a new headset and may just buy a new HX550 since amazon sells them for ~$35