The product fulfills its function fully, and at the super low price! Of course, the introduction of nano SIM card not easy. This is however, in my opinion simply on the size of the SIM card and not on the adapters, the card is supposed to be well secured in the adapter. If this could be so built with more game slide around the SIM in it. So just press dei Sim card exactly in the adapter and it can be some time;). !! When storing the adapter should be careful. Depending on the design of the SIM card slot, the contact springs as barbs stuck in the recess for the SIM card. (It should be clear, but maybe that should someone mention here ^^) !!! (So if possible do not keep the adapter in the SIM card slot.) S Super item!