Default [Q] How can i tell if my tablet is locked or unlocked?

I have just bought myself the new WIFI only versoin of the Z2 tablet, i will be selling my Z1 soon, but when i bought it from ebay, the guy told me he got it from an EE store, it is the SGP321, wifi and sim, although i have never used a sim card in it.

At the time i got it for a really good pricew, probably on par with the price of a wifi only model, but with me now wanting to sell it, i am unsure if i would need to list it as locked to EE or if its unlocked?

Is there any easy way i can find out?

Thanks

James
Samsung Galaxy S4 I9505
Sony Xperia Z2 Tablet