Comment: my 2c

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my 2c

turning it off is not safe - the IMEI and SIM are still connected to the network as is the GPS chip as long as it has voltage available.

that's why the FCC has made the GPS chip mandatory in all cellphones sold in the US by 2014.

best solution - a very old phone that's not linked to you, a prepaid card and a 5$ Faraday Bag from ebay.