i have an extra iphone 4 which i do not use.. but i want to safe it for later.. as you all know temperature in canada in the winter is cold, and i keep the iphone4 in the basement all the time. i want to know is it bad to leave iphone in temperature range from 0-15C all the time during winter?.. should i put it my bedroom instead?, and when the summer comes then put it back in the basement.. thank you for any suggestion. 