Can an iPhone 4S purchased in Canada be used in mainland China and download apps by using a Chinese credit card?

Hi,
Can an iPhone 4S purchased in Canada be used in mainland China, and also download apps by using a Chinese credit card?
Thanks.

Could it be because the SIM card got damaged while I cut it to fit the IPhone?
Very likely. Hard to believe the carrier in Mexico doesn't have a micro-SIM card available.
Or somehow the Chinese carrier found out and locked it?
No, which is not possible.
What can I do? Get a new SIM and see if it works again?
Get a micro-SIM from the carrier in Mexico that you don't have to manually cut down. If that carrier doesn't provide one, switch to another carrier that is not so low-budget.

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