Currently Being ModeratedJan 21, 2014 6:37 PM (in response to meaghanchristina)
What version of IOS is the iPhone 4 running? Try restoring your iPhone 4 from iTunes if available and try to activite again. If the problem persist you may call 1-800-275-2273. (Please Note, it may take up to 7 minutes for iMessage to activate.) Good Luck!!