Q: no activate it

I just resat my iphone 5s and when i activate it it says

your iphone could not be activated because the activation server is temporarily unavailable. Try connecting your iphone to itunes to activate it, or try again in a couple of minutes.

if this problem persists, contact apple support at apple.com/support.

i try the all ways but it doesnt work.

can any body help me with this?