I'm getting so freaking frustrated?

Okay so I just got my iPhone 6 from sprint and ecerytime I'm on the phone I can't access to my internet. Why?
Like I'm on the phone and the (LTE, 3G, 4G) sign comes off and once I hang up it starts working again!
Why? What do I have to do?

While you are using voice network, data network is always auto disabled.

Both can't be active at the same time.

But they can inturrupt each other and take lead.

As per the default setting, voice calls are given priority over data.

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