How to tell if my iphone 5 is unlocked, and i won't loose anything if i restore?

I got my iPhone 5 unlocked, but can't remember if it said congratulations or not…

imei.info doesn't tell me

I'm in the UK currently on 3, if that helps?

Please answer me!

Hi if it locked we restore default so all data at i phone will lose to unlock sim
we can help you to unlock it we're from UK also please contact me at

sales@unlockingsmart.co.uk
or
at facebook at
https://www.facebook.com/...ckingsmart
or
at phone number
004401443319803
00440149523028

with pleasure
David Smart