We have three types of SIM cards, which all do the same job but differ in size. These SIMs are known as:
Standard
Micro
Nano
Standard
This is the original SIM size and is mainly used in older phones and devices.
Example of devices using the standard SIM:
Apple- iPhone 3GS
Samsung - Galaxy SII, Note
Nokia - 300, 301
HTC - Desire HD
EE Mobile broadband/4G WiFi - Buzzard, Osprey
Micro
Micro SIMs are a smaller size. These are mainly used in smartphones.
If you're using a recent smartphone and it doesn't take a micro SIM, you might need a nano SIM
Examples of micro SIM devices:
Apple - iPhone 4/4S
Apple iPad Retina Display
Sony - Xperia S, T, X, Z
HTC - One, One X, One SV, 8X
Nokia - N9, Lumia 720/820
Samsung - Galaxy Express, SIII, S4, Note II
Nano
Used with the latest Apple devices, this is the smallest size out of the three.
Examples of nano SIM devices:
Apple - iPhone 5, 5c, 5s and iPad Mini
HTC - One (M8) HTC Desire 610
Multi and Combi SIMs
Multi SIM
This is the latest type of SIM card, which holds all three formats (standard, micro and nano) in one.
Combi SIM
This SIM card can hold either a standard SIM or a micro SIM.
