[GadgetKen]

Have had good luck with a dual sim quad band MFU V200 phone. Simple features, works well, very sturdy. Very basic though with a camera/video camera, MP3/MP4 player, FM stereo...no wifi, no alphanumeric keyboard, no TV, no touchscreen. But it does the job.

For a phone purchased from the US, lowest risk would probably be a Beyond E-Tech Duet dual sim phone. Only maker I'm aware of that has dual sim phones that are US FCC registered. You could also try before you buy at a store. Can be bought from several dealers including: Search Results for duet phone at JR.com They also have one of the lowest SAR ratings of any phone officially sold in the US: Other manufacturers cell phone radiation chart - CNET Reviews