iPhone 5 with Canadian SIM a battery life short when in the USA

I have an iPhone 5 with SIM card from a Canadian supplier (Koodo, the cheaper version of Tellus).

When I travel to the USA, I noticed a much quicker battery discharge rate, approximately 1.5% per hour, when I use the phone in the Canada.

In the USA, I disable cell and remove most of the applications of memory and minimize location services. Nothing seems to help.

When the last in America, I removed the SIM tray and battery drain rate is back to normal!

Why iOS even converses with the SIM card when cellular service is disabled in the settings?

Any suggestions? Remove the SIM card is a bit of a pain!

Check the settings > farm to find out which applications consume more battery.

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