-70 deg c is overkill, but -20 is not enough. There are plenty of places in the US and Canada with GSM coverage where temperatures are often in the -20 to -30 range (northern Minnesota, the prairies, Quebec, etc.)
Latitude wireless operates in the Yukon, NT, and Nunavut, but they use CDMA phones. It often gets to -30 or -40 in Tuktoyaktuk, Iqaluit, and Old Crow.
I've used my iPhone below -20, but I keep it in an inside pocket so the handset itself never gets that cold.
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cold, but not that cold
-70 deg c is overkill, but -20 is not enough. There are plenty of places in the US and Canada with GSM coverage where temperatures are often in the -20 to -30 range (northern Minnesota, the prairies, Quebec, etc.)
Latitude wireless operates in the Yukon, NT, and Nunavut, but they use CDMA phones. It often gets to -30 or -40 in Tuktoyaktuk, Iqaluit, and Old Crow.
I've used my iPhone below -20, but I keep it in an inside pocket so the handset itself never gets that cold.