There are three types of SIM card sizes:
– The standard SIM card (dimensions: 25 x 15 mm);
– The micro SIM card (introduced by the iPhone 4, but now commonly used in most smartphones);
– The nano SIM card (used in some smartphones such as the iPhone 6s, iPhone SE, Samsung S6, Samsung S7, and iPads).

At UNDO, we provide a multi-format SIM card as standard. This card contains all SIM card sizes in one convenient format. You only need to punch out the desired size from the card. If you accidentally choose the wrong size, don’t worry, you can use the remaining sizes as an ‘adapter’: click the smaller size back into the larger form and insert it into your device.