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Going to be a hefty price sim free £700 ish
It's only ever the Note 3 that's been of any point buying on a contract to get it cheaper to be honest.
I pay £13 with 3 for Unlimited data and the minutes and text are wasted on me, so it will probably still be better value going SIM free. I'll always have a good look round and see if any special offers or free gifts make it worth the contract, but as long as I'm ready with the SIM free cost I won't be disappointed.