acm:? Cell phone that can, literally, "take the heat"

Hello. Was wondering if one of you could help me decide on a second
phone to keep in my car always.

I need to have my other cell phone with me at all times.

I use my cell phone in the car, at work and at home.

Problem: I've always had trouible with forgetting to bring the phone
to/from work becuse I'm usully running late for something.

Climate: it's been very muggy and hot outside, I am concerned that
whatever second phone I choose, will "melt" or overheat.

Can you recommend a phone whose best features is that it won't stop
working if you leave it out in the car on a hot day or near the sun?

Or soed anybody know of a bag or device i can wrap this phone around
to block out the heat?

Thanks, New