Hello, if your iPhone 5s has been unlocked, you should be able to use any SIM card.
You can check if your iPhone has been unlocked by following these steps:
2.Tap Mobile Data > Mobile Data Options. (If the device is set to American English you'll need to tap Cellular > Cellular Data instead.)
3.Check for an option named Mobile Data Network (or Cellular Data Network).
If you see the Mobile Data Network option, your iPhone should be unlocked.
If it isn't, you can follow these steps to unlock your iPhone:
1.Contact your provider and request an unlock using the contact details and online tools listed below.
2. If you haven't got the original SIM, you'll need to reset the phone before it can be unlocked.
3. Power down the phone, then replace the old SIM card with a SIM from a different network.
4. Check that the iPhone is able to connect a phone call over the new network.