Urgent: Is SIM card affected when master clearing a phone? (specifically Pantech Duo)?

queso

New member
I own a Pantech Duo and it has been acting up for a month or so now. When I clear all messages, the messages are deleted. But upon turning the phone back on, all the messages reappear again. My phone also randomly turns off without making any sounds or notification or anything. So, I've decided to master clear the phone.
I have all my contacts saved on the SIM Card as SIM contacts. When I master clear the phone, does the clearing process affect the SIM card or just the phone?
 
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