How to open the phone?

[SpoofyKid]

Edit 5 min later: Well, a knife point worked to get the gap started. Then I used my nail. Still *very* tight and took a lot of coaxing. I think people will need a heads-up to expect this when the general-user-version goes out.

Mate, you're scaring me. There is a notch, specifically there to place your fingernail into (or a blunt and soft tool). You do not need to create a gap! Sorry, I'm not yelling, I'm just trying to make it obvious that there is a purposely made notch to separate the back cover from the phone. It is a bit rigid, but it's all pretty tough, so shouldn't break by you tugging on it.

See this photo, it's on the bottom right of the phone/back cover 
  IMG_20200613_173147~2.jpg (Size: 191.59 KB / Downloads: 371)

I hope this clarifies things

[saba]

There is a tool for this sort of thing, called a "spudger". I suggest a vinyl one (not metal). They are typically very inexpensive.

You could also use a guitar pick. That might be easy to come across for some people. I have no problem using my thumbnail though.

[bcnaz]

I use two thumb nails in the notch, then go around the whole phone spreading the gap all the way around.

I do have one small crack in mine now because I tried 'gently tugging' after just widening the gap at notch.

IF you slide your nail ( in the gap ) around the whole phone it will pull off easily.

[AddieDirects]

I use a spudger to get the back off mine. Don't want to ruin my nails LOL.