Which phone did you got? --- Post updated --- Have you heard of Touchwiz? It lags like hell after use for a year.
Id say see if you can get a used s7 or used a5 from samsung. You could find a used s7 for about 350-400
P10, it's far more durable and reliable IMO. Chinese-made smartphones, especially from Huawei and OnePlus, are decent these days.
DONT EVEN THINK ABOUT BUYING A PHONE UNLESS YOU CHECK OUT A ONEPLUS I have the oneplus3t and its the best phone I have ever owned. Its a new phone and it does everything with a 16mp camera! here is a link http://www.techradar.com/reviews/oneplus-3t-review ONLY FOR $500 i know your budget is 400, BUT if you find a refurbished one on amazon it will be a lot cheaper I really suggest thsi phone
I entertain you boys a little... Had a friend complaining how poor his phone's camera is, but he didn't have money to upgrade the phone. Well, you know me, I'm quite creative guy and if there is opportunity for fooling around, I'm in difficulties, can't resist, so this is what I did, smartphone camera upgrade: I don't understand what he got so upset about though Carry on
Nokia 3310 It's durable and has a long battery life and if you get attacked you can use it as a weapon, also with the money you save you could buy a good camera
Okay, maybe this one could be interresting for you It's the Asus Zenphone 3 Max. It has a good battery (4100mAh), has a ok score (36.870 in Antutu Benchmark according to KiMovil), a 13 megapixel camera and it's pretty cheap (159€)
Maybe get the Asus Zenfone 4 Max Pro. it has 5000 mAh of battery, A good camera (16MP), Good score (43.000 in Untutu according to KiMovil) And the price is 270€.