What happens if I snap my SD card?

So I want to cancel my provider (Like T-Mobile or whatever) for my iphone 4s, ans I heard that If you snap the SD card your number and provider will be erased andyou won't be able to receive calls. Please tell me if this is true, If it isn't please tell me how I can cancel my provider without calling them (because it takes to long)

Your SD card has nothing to do with it, did you mean your SIM card? Even that won't do it, you'll not be able to make or receive calls with a broken SIM, but you'll still have an account with the sevice provider and they will expect you to pay.
You can write them a letter, send an email, or just stop paying your bill, they will disconnect you eventually.
If you are under a contract, then you might have to pay a termination fee.

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