A couple of days ago we reported on a rumor that European carriers were stockpiling nano-SIMs in anticipation of the iPhone 5. Now it seems that the rumors have been taken up one level as there are now reports (via BGR) that Apple is supplying various carriers with nano-SIM adapters so that the carriers will be able to test how the nano-SIMs work on their networks. With Apple submitting its own nano-SIM design to be used as a standard, many have believed that the nano-SIM could be making its way into the next-gen iPhone. With a smaller SIM card, it is expected that it should give Apple a bit more space to work with in which they will be able to add other features into the phone that they previously might not have been able to, such as 4G LTE, a larger battery, etc. Of course all of this is simply rumor for now since nothing can be confirmed yet, so we suggest you take this with a grain of salt for now until the iPhone 5 (or whatever it’s going to be called) has been revealed.