Why is my iPhone 6s charging so slow?

I got a iPhone 6s for Christmas and it all of a sudden started charging Really slow like now it's on the charger and it's been about 30 min and it's only on 17 percent. I'm still using the charger from out the box

Try turning on airplane mode.

Opening airplane mode, turning off Wi-Fi and Bluetooth will help, or just shutting it down when charging to keep it from working while charging

Well it should be fully charged in about 2 hours and it automatically fast charges to 80%. Try use an iPad charger if you have one or one that outputs 5V 2A. If it still slow then take it to the Apple Store or place you bought it

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