I needed to file my att sim a tiny bit with a nail file to get the edges into this tray, but it works great in my Lumia 635

Getting the combo inserted into my GS5 is a tricky bit since the nano sim wants to fall out

I switch between phones and some still use a micro SIM as opposed to a nano SIM.

So, I really need to have reliable SIM adapters that won't get stuck

Nano to micro adapter was not working at all, nano sim wouldn't fit in grooves in adapter.

The Mini SIM adapter fits the SIM very snugly, so little risk of falling out, and had no problems removing the SIM from the phone again.

I have a nano sim from cricket and the nano to standard does not work

After some trimming of the sim it seems to be working ok, although I was very uncomfortable doing the trimming because of my fear that I would ruin the sim.

I use it to connect a nano sim into a mini sim for an Iphone 4S and worked like a charm.