Lost my iphone in the cold outside?

I'm an idiot, had a rough night last night. Got dropped off at home last night, was completely locked out in the freezing weather. Phone was dead. And I end up on my neighbors couch because it was die, or go there. Woke up, no phone. Walked to my house, my phone is sitting in the driveway FROZEN.
-___________________________-

I haven't charged it or tried to turn it on. It's a iphone 5.
I currently have it next to my heater. What should I do or when should I turn it on?!

Keep calm, remove the battery if you can, and don't put front heater, this may damage sensitive components.
you can try put your iphone in a recipient with rice and close it well, the rice absorbs moisture. Leave it a whole day

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