Source: apple.com
Find your model in the list to see which SIM card your iPhone or iPad with Wi-Fi + Cellular uses.
Nano SIM card

iPhones with Nano SIM
- iPhone 6s Plus
- iPhone 6s
- Phone 6 Plus
- iPhone 6
- iPhone 5s
- iPhone 5c
- iPhone 5
iPads with Nano SIM
*These models are compatible with Apple SIM.

Micro SIM card

iPhones with Micro SIM
- iPhone 4s
- iPhone 4
iPads with Micro SIM
- iPad (4th generation)
- iPad (3rd generation)
- iPad 2
- iPad

SIM card

iPhones with SIM
- iPhone 3GS
- iPhone 3
- iPhone

Learn more
- Identify your iPhone or iPad model.
- Damage to the SIM tray or the device caused by a modified SIM card isn't covered by Apple's hardware warranty. If you cut or modify your SIM card to fit a different device model, you might not be able to connect to cellular networks or access certain features using that device.
- If you get a new iPhone and your old SIM card won't fit, contact your carrier to move your account to the SIM card that came with your iPhone, or ask how to get a new SIM card if your iPhone didn't come with one.