My iMessage is slow/not working?

I'm using my Wi-Fi (free) for my iphone but sometimes I send a message to another iphone user & don't get a tex back for hours so I turn off my Wi-Fi and turn on the Att Wi-Fi (not free) & it will show there messages pop up, does anyone know what the problem is?

Maybe your Wi-Fi connection isn't stable? Do you have anything else connected to Wi-Fi to confirm it's stability? Generally, Wi-Fi speeds are going to be much faster than cell data.

Seems like your Wi-Fi is weak.

Wi-Fi problem, try sending on cellular data, if it works than the problem with the Wi-Fi.

That does not really make any sense. What do you mean when you say that you turned off Wi-Fi and turned on AT&Ts Wi-Fi?

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