HTC One (M8) SIM tray

New HTC flagship uses smaller SIM standard

Today, after weeks of speculation and online leaks, the new HTC One — also known by its codename "M8" — is official. And in some parts of the world the device has gone on sale immediately on launch day. But if you're thinking of picking up HTC's latest aluminum-clad smartphone right off the bat, you may need to think about swapping out or resizing your current SIM card first, as the new HTC One uses a nanoSIM.

Most carriers can send you a new SIM in the mail, or switch you to a nanoSIM in-store.

NanoSIMs will be familiar to users of many of Apple's more recent iOS devices, as well as Motorola's Moto X. They're smaller than the microSIMs used by most current Android phones, meaning they take up less precious internal space in the device. In most cases your carrier will be able to send you a new nanoSIM to replace your current SIM — some will even do it in-store while you wait — though there may be a charge for this.

An alternative — though not one for the faint of heart — is to cut your larger SIM down to nanoSIM size. Our own Jerry Hildenbrand wrote a great guide to nanoSIM cutting back when the Moto X launched, and it's worth a look if you're considering this route for your new M8.

And remember that once you've switched (or sliced your way down to) a nanoSIM, you’ll need a SIM-card adapter if you ever need to size back up to a micro.

More: For the bold: Cutting your own Nano SIM card