I have a Galaxy S5, so your phone should be a little smaller than mine. The first headset I bought was this. It was cheaper at the time. I found my phone had a little trouble fitting unless I removed its case. The case made it too thick.

Not long after that I ended up ripping the cardboard, so then I bought this. My only complaint about the second set is that there is not a magnet/washer for the apps which rely on it. That said, being able to adjust the interpupillary distance is very nice. If you have a USB controller you want to use with apps, I'd also recommend adding an OTG cable to your order.

Make sure the model you purchase has a head strap. It can ruin the immersion if you have to constantly hold the darn thing up. Hope that helps!