Whatsapp messenger, not working?

I'm so confused. It was working fine and now for like 3 days the messenger sends the message but only has a single check mark. Never two. I don't think i'm able to send any outgoing msgs or receive any either.
i tried reinstalling. I tried rebooting. Its not working. Anyone else having issues?

i'm on my iphone 4s

Added (1). I wonder, if they are having issues with their phone or the app isn't working.

Single check means the message got sent and is waiting to be received on the whatsapp server.
you only get the 2nd check when the message is received by the recipient. The whatsapp on whoever you're sending the message to isn't working

I'm not able to type outgoing whatsapp messages on my iphone

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