I just received this pack of nano to micro sim adapters from amazon. I was a little reluctant to try them as I've read some scary stories about various sim card adapters getting stuck and ruining phones. Anyway, these are very precise and hold the nano perfectly. The top surface is smooth and flush with an ATT nano sim inserted. I tested the adapters five times in my 8x and five times in my q10. Sim card insertion and removal is very smooth. Not a hint of bind. Do not put the adapter in you micro sim phone without a nano sim in it!
Amazon.com: Bluecell 3 Cellphone SIM Card adapter/converter (Nano-Micro) for Apple iPhone user: Cell Phones & Accessories
Amazon.com: Bluecell 3 Cellphone SIM Card adapter/converter (Nano-Micro) for Apple iPhone user: Cell Phones & Accessories