how do i please unlock a SIM lock on nokia lumia 635 by the mobile operators?

[Obed Nimoh Kwakye]

SIM error - contact mobile operators but don't know what that mobile operators mean

 

[xandros9]

Mobile operators is another term to refer to cellular service providers/carriers. Examples include T-Mobile, Rogers, Telus...

As for unlocking a SIM lock, you'll need to contact the carrier that your 635 is locked to.