Iphone 5c constantly disconnects from the internet?

My daughters Iphone 5c constantly disconnects from the internet, it doesn't matter if its my home Wi-Fi, other Wi-Fi's or my phones internet. It had been working fine from december but the last 4 or so week's it disconnects every 2-3 mins. It has all the latest updates & I just need some help if there's a solution for this as the phone is only 4months old & i'm not happy about paying for a phone that doesn't work.

Just go to your local wireless carrier store and they will fix it for you for free.

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