If your OVO SIM card has arrived in the mail, you're almost ready to go.
All OVO SIM cards are multi-fit - there are 3 sizes all included in the SIM package. So, when you get your SIM card carefully remove the whole plastic business card. You should see that there are 3 slightly different sized SIM cards that you can push out. You just need to choose the one that fits your phone. You can choose a nano, micro or mini (regular) SIM card.
If you're not 100% sure what sized SIM card your phone or tablet takes you can either open up your device and take the old SIM card out or take a look at the SIM card slot in your phone and compare this against the options on the OVO SIM card.
The picture below shows what the 3 types of SIM cards look like and gives you a rough idea where you'll find these on your OVO SIM package.