Well, the title of this post pretty much says it all.
As you know, the new iPhone 4 uses a Micro SIM card as opposed to the standard size SIM card.
This will present a problem for those of us who may wish to occasionally remove the Micro SIM card from iPhone 4 and insert it in to a device with a standard SIM card slot, such as a Samsung Epix Smartphone.
No worries for now you can quickly and easily purchase a Micro SIM adapter from the following trusted online store for approximately 10 USD. In effect, this adapter lets you insert your Micro SIM card into a standard size SIM card slot.