- Download and print this page at 100% scale on an A4 sheet.
- Fix your SIM card with double-sided tape to the printed template.
- Use a ruler and a marker to draw the cut lines onto your SIM card.
- Cut your SIM card along the drawn lines using scissors. Cutting contacts usually does not impact functionality as the actual chip below is much smaller.
- Round the edges by grinding them with sandpaper or a file.
Including tolerance defined by ETSI specifications (p.20) (+30µm/-70µm) NanoSIMs (0.67mm) are just 60µm thinner than a Mini SIM (2FF) or Micro SIM (3FF) (both 0.76mm), which corresponds to the thickness of a human hair and thus does not make a difference in practice, notably not on the iPhone 5.