4g sim into a iphone 4

[Kieran..]

Need a bit of help i am waiting for my upgrade to arrive, iphone 5s and I'm getting a 4g SIM card obviously but I'm gonna just stick with my iphone 4 a bit longer and sell on the 5s

but will my new 4g SIM card work in the iphone 4? And will I pick up 3G?

 

[l33th3tr33]

You should pick up 3G but I don't think the 4 is capable of picking up 4g.