Q- Which cell phone do you use, and what is SAR?
1. I don't use a cellphone on a daily basis. I do have an old 3G (UMTS/WCDMA) phone for emergencies which I use once or twice a month (with air tube earpiece) and a car phone with the antenna on the external side of the wind shield.
The reason is that every cellphone, even "low" SAR phones, emits RF and ELF levels that are too much for me and cause me pain after few seconds.
2. SAR is a measurement Technics that servers the need of the wireless industries to show as if the phones are tested and found to be safe. In reality it is based only on thermal damage and is not relevant to any biological damage what so ever.
3. a phone with low SAR level, with not necessary radiates less then a phone with high SAR level
4. There are other parameters that effect the levels of emission from each phone in each and every situation, such as: reception, setting of the phone, way of using it, technical parameters and other variables.
About the SAR please see - http://norad4u.blogspot.co.il/2013/03/why-sar-standard-is-not-relevant.html
About how to use a cellphone while reducing exposure see - http://www.norad4u.com/emr-reduction/using-the-mobile-phone