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There are four different SIM types. You'll need to get the correct SIM for your phone, or it won't fit in the phone's SIM card slot.
A nano SIM is the smallest SIM card and is used in phones like iPhone 5s, 5c and 5, HTC One (M8) and the Nokia Lumia 1520.
This is the second smallest SIM, and is the most common one used in smartphones. iPhone 4 and 4S, Sony Xperia™ Z1, Samsung Galaxy S5 and S4 all use this size.
Another very common SIM size that's used in lots of older smartphones and most feature phones like the Samsung Galaxy Ace, Nokia Asha phones and older BlackBerry phones.
This is the same as a standard SIM but gives older BlackBerry® devices access to BlackBerry services. This is not needed for new BlackBerry phones running BlackBerry 10 OS such as the BlackBerry® Q10.