It's probably the battery. Batteries usually last 4-5 years before they completely die, and this phone model is 6 years old. Since this is an older phone model, the battery might be hard to find in a store (such as batteries plus) for a quick solution, but if you can, it should be pretty cheap. I'd say $15-25. If you can't find it in a store, they are about $6 including shipping online...but honestly, I would just upgrade to a new phone. You can get a simple phone usually for free, and it's a much faster and easier solution.
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It's probably the battery. Batteries usually last 4-5 years before they completely die, and this phone model is 6 years old. Since this is an older phone model, the battery might be hard to find in a store (such as batteries plus) for a quick solution, but if you can, it should be pretty cheap. I'd say $15-25. If you can't find it in a store, they are about $6 including shipping online...but honestly, I would just upgrade to a new phone. You can get a simple phone usually for free, and it's a much faster and easier solution.
I'm still gonna say it's the battery. Buy a new one online