bought from a friend its locked not sure which provider its with
NEED TO FIND OUT WHAT PROVIDER MY PHONES WITH TO USE IT
iPhone 6s
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See this link --> How to unlock your iPhone for use with a different carrier - Apple Support
But, are you suggesting the friend you bought the phone from doesn't know who they had cellular service with? If the phone really was their phone, it seems very hard to believe they don't know who they paid for service from, like AT&T, Sprint/T-Mobile, Verizon, etc.