Samsung S6 Unlocking

I have just got a new S6 phone on Vodafone but want to unlock the phone to use any sim. I went into Vodafone store and asked about this and was told the process would take 30days! Does anyone know a good place to get this done quickly? Seen plenty web sites but not sure if these are good to use or not?

Thanks

Ian

I've got the same query on an iPhone 5s.