Question about Apple iPhone 5C

Hello!

If you mean a pre-paid bundle, I don't see any mobile phones at Galaxus or digitec.
But if you mean can you use your pre-paid sim card, then yes. As long as it is a nano sim card (the size of the sim card is meant by this).

This means that you order the mobile phone at full price (there are no discounts for pre-paid anyway) and simply insert the sim card from the corresponding provider.

If I have misunderstood something, please let me know :)