Found this list in cnet website , 10 highest radiation cellphone and 10 lowest radiation cell phones ( USA)

Ten highest-radiation cell phones (United States)

Manufacturer and model SAR level
(digital)
1. Motorola Slvr L6 1.58
2a. Motorola V120c 1.55
2b. Motorola V265 1.55

4. Motorola V70 1.54
5a. Motorola C290 1.53
5b. Motorola P8767 1.53
5c. Motorola ST7868 1.53
5d. Motorola ST7868W 1.53
9a. Motorola A845 1.51
9c. Palm Treo 650 GSM 1.51
9b. Panasonic Allure 1.51

Ten lowest-radiation cell phones (United States)

Manufacturer and model SAR level
(digital)
1. Audiovox PPC66001 0.12
2. Motorola MPx200 0.2
3. Motorola Timeport L7089 0.22
4. Qualcomm pdQ-1900 0.2634
5. T-Mobile Sidekick 0.276
6a. Samsung SGH-S100 0.296
6b. Samsung SGH-S105 0.296
8. Sony Ericsson Z600 0.31
9. Mitsubishi G360 0.32
10. Siemens S40 0.33