Why won't my iPhone play videos on Instagram?

So I have a iPhone 4 on net 10 prepaid with unlimited talk, text, and web. But every time I try to play a video on Instagram it won't work? It loads for about 5 seconds n then it's just froze with a circular arrow(The Retry or refresh button) but everything works on Wi-Fi. Does anyone know wats the problem? I tryed rebooting my phone n updating instagram n my iPhone but still.

I guess we have to wait for the next update or just complain to the CEO of instagram

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