Your connection does not support online multiplayer?

I've recently downloaded cod-black ops zombies on my iphone and ipad but there seems to be a problem with multiplayer. I googled everything and tried even port forwarding! Nothing! Can anyone help with a fully-detailed guide?

Thanks

Added (1). If i change my modem will it be ok?

"your connection" mean your Wi-Fi so that means that whatever Wi-Fi you're on isn't good enough to support the online playing

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