Bought the Samsung Galaxy S4 still posted today. After 1 day of use, I noticed that the gyroscope, accelerometer, proximity sensor and oscillometer are not working (Dialled *#0*# to be sure). I texted the seller and he immediately replied (good!). He suggested several things, none of which worked. He insisted that the unit was working 100%. I sent another message asking if he could honor his personal warranty but he no longer replied. I called him several times BUT he did not answer. So I asked my friend to call him and inquire regarding another product and he answered immediately.

I had to bring the device to a Samsung Service Center who doubted the phone's authenticity but it was probably the sensor at the back that was faulty. They quoted a 12k Php price to have it repaired so I brought it to a repair center elsewhere and had it fixed there. They said that the phone's sensor was a replacement part BUT was broken due to water damage.

I bought a second hand phone to be able to save some cash. Unfortunately, I had to pay extra to have this seller's phone fixed.