If I transfer my phone number to a thrifty phone, will my phone be fully reset?

I transferred my phone number to a thrifty phone for the first time.

Do I have to buy USIM?

I've never put a new USIM, so I don't know what's going on.

Will the phone be fully initialized if I transfer the number to a thrifty phone and insert a new USIM?

I wonder if the app has to be installed again because the factory has been initialized like when I first bought the device.

1237 2017-08-02 Gentleman

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