Why is my cellular data on sprint all of a sudden so slow?

My mom, my sister and I, all have an iPhone 6 on sprint. All three of us usually get a good LTE signal rarely dropping to 3g (but sometimes it does) when we're at home. And my dad has an iPhone 5c and same thing for him. But today all of our iPhone 6 can't get lte for even one second. But I looked at my dads phone and he has a strong lte signal constantly and I did a speed test on his iPhone 5c and got ping of 50ms, download 13mbps, and upload 3mbps. His Ping is better than what I get on my phone even on lte at my house. Why are the iPhone 6 being slow?

Might be a problem with the phones. Antenna on the iPhone 5C is better than the iPhone 6 thus the signal drop.

Switch on and turn off the Airplane mode, it might help you and in case of gaining the best app according to me, Leo Privacy Guard would be the best.

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