SIM cards come in three different sizes: Standard SIM, Micro SIM and Nano SIM. The right size of SIM card to fit in your handset will depend on the manufacturer and the model of your smartphone. Wireless Traveler Super Saver SIM cards are perforated so you get all 3 SIM card sizes in one SIM card to fit every model phone.

sim-card-chart
From left to right: Standard SIM, Micro SIM and Nano SIM. Picture adapted from Wikipedia (CC-licensed).

The dimensions of the three types of SIM card compare as follows:

SIM Type Length (mm) Width (mm) Height (mm)
Standard SIM 25.90 15.00 .76
Micro SIM 15.00 12.00 .76
Nano SIM 12.30 8.80 .67
Alcatel ONE TOUCH 768T Regular SIM Card
Alcatel ONE TOUCH 908 Regular SIM Card
Alcatel one touch A392T Micro SIM duo Card
Alcatel one touch Idol 3 Micro SIM Card
Alcatel ONE TOUCH M'Pop Regular SIM Card
Alcatel one touch Pixi 3 (4.5) Micro SIM Card
Alcatel one touch Pop D3 Micro SIM Card
BlackBerry Bold 9700 Regular SIM Card
BlackBerry Bold 9900 Regular SIM Card
BlackBerry Classic Nano Sim Card
BlackBerry Curve 9300 Regular SIM Card
BlackBerry Curve 9360 Regular SIM Card
BlackBerry Pearl 9100 Regular SIM Card
BlackBerry Torch 9810 Regular SIM Card
BlackBerry Torch 9860 Regular SIM Card
BlackBerry Q5 Micro SIM Card
BlackBerry Q10 Micro SIM Card
BlackBerry Z10 Micro SIM Card
Garmin A50 Regular SIM Card
Google Nexus One Regular SIM Card
HTC Amaze 4G Regular SIM Card
HTC Desire Micro SIM Card
HTC Desire 510 Micro SIM Card
HTC Desire 626s Nano Sim Card
HTC Flyer 4G Regular SIM Card
HTC One M9 Nano Sim Card
HTC One S Micro SIM Card
HTC Panache Regular SIM Card
HTC Radar 4G Regular SIM Card
Huawei Ascend G7 Micro SIM Card
Huawei U3200 Regular SIM Card
Huawei U7519 Regular SIM Card
iPhone 5c Nano SIM Card
iPhone 5s Nano SIM Card
iPhone 6 Nano SIM Card
iPhone 6 Plus Nano SIM Card
iPhone 6s Nano SIM Card
iPhone 6s Plus Nano SIM Card
LG dLite Regular SIM Card
LG F4n Regular SIM Card
LG F4NR Regular SIM Card
LG F60 Micro SIM Card
LG G2 Micro SIM Card
LG G3 Micro SIM Card
LG G4 Micro SIM Card
LG G4 Vigor Micro SIM Card
LG G Stylo Micro SIM Card
LG Nexus 4 Micro SIM Card
LG Nexus 5 Micro SIM Card
LG Optimus 2X Regular SIM Card
LG Optimus 4X HD Regular SIM Card
LG Wink Regular SIM Card
Mobile Internet Key Regular SIM Card
Mobile Wi-Fi Regular SIM Card
Moto E Micro SIM Card
Moto E LTE Micro SIM Card
Moto G Micro SIM Card
Moto G LTE Micro SIM Card
Moto X Play Nano SIM Card
Motorola RAZR V Regular SIM Card
Motorola Spice Regular SIM Card
Motorola XT720 Regular SIM Card
Nexus 5X Nano SIM Card
Nexus 6 Nano SIM Card
Nexus 6P Nano SIM Card
Nokia 500 Regular SIM Card
Nokia 5230 Regular SIM Card
Nokia C5-04 Regular SIM Card
Nokia C7-00 Regular SIM Card
Nokia E73 Regular SIM Card
Nokia Lumina 710 Micro SIM Card
Samsung C414V Regular SIM Card
Samsung Galaxy A5 Nano SIM Card
Samsung Galaxy ACE II e Regular SIM Card
Samsung Galaxy Alpha Micro SIM Card
Samsung GALAXY CORE LTE Micro SIM Card
Samsung Galaxy Grand Prime Micro SIM Card
Samsung Galaxy Mini Regular SIM Card
Samsung Galaxy Nexus Regular SIM Card
Samsung Note II Micro SIM Card
Samsung Note 3 Micro SIM Card
Samsung Note 4 Micro SIM Card
Samsung Note 5 Nano SIM Card
Samsung Galaxy Q Regular SIM Card
Samsung Galaxy S III Micro SIM Card
Samsung Galaxy S4 Micro Sim Card
Samsung Galaxy S5 Micro SIM Card
Samsung Galaxy S5 neo Micro SIM Card
Samsung Galaxy S6 Nano SIM Card
Samsung Galaxy S6 Edge Nano SIM Card
Samsung Galaxy S6 Edge + Nano SIM Card
Samsung Galaxy Tab 10.1 4G Regular SIM Card
Samsung Galaxy Tab S 10.5 Micro SIM Card
Samsung Gravity 2 Regular SIM Card
Samsung Gravity Touch Regular SIM Card
Samsung Nexus S Regular SIM Card
Samsung T159V Regular SIM Card
Sony Xperia L Regular SIM Card
Sony Xperia M2 Aqua Micro SIM Card
Sony Xperia M4 Aqua Nano SIM Card
Sony Xperia T Micro SIM Card
Sony Xperia ZL Micro SIM Card
Windows Phone 8S by HTC Micro SIM Card