Promo codes are unique codes that you can use to buy your skitto SIM. When you use a promo code to buy your skitto SIM, you will get additional bonus data!
You can get promo codes in two different ways:
If you create your promo code from the above link, you will get 1GB bonus data with 7 days validity
If you create your promo code from an invitation link, you will get 2GB bonus data with 30 days validity
By the way, you can only use ONE promo code to buy your skitto SIM. Also, promo codes can only be applied before you buy the SIM. If you create a promo code after you have already activated your SIM, you will not be able to use that code.