Type of sim card Topup link
Australia https://www.prepaidzero.com/australia-topup.html
Austria See product type: Europe (All of Europe)
Belgium See product type: Europe (All of Europe)
Canada https://www.prepaidzero.com/canada-topup.html
China https://www.prepaidzero.com/china-topup.html
Denmark See product type: Europe (All of Europe)
Europe (All of Europe) https://www.prepaidzero.com/product/recharge-europe-sim/ 
For “3” sim cards (5 GB, 12 GB)(if your sim card was activated from the portal page, please top up from that page by logging in)
Only 1 GB and 3 GB sim cards.
https://portal.prepaidzero.com
Europe (Travelsim only) https://www.prepaidzero.com/europe-topup.html
Finland See product type: Europe (All of Europe)
France See product type: Europe (All of Europe)
Germany See product type: Europe (All of Europe)
Greece See product type: Europe (All of Europe)
Hong Kong https://www.prepaidzero.com/hongkong-topup.html
Indonesia https://www.prepaidzero.com/indonesia-topup.html
Ireland See product type: Europe (All of Europe)
Israel https://www.prepaidzero.com/israel-topup.html
Italy See product type: Europe (All of Europe)
Latin America https://www.prepaidzero.com/latin-topup.html
Netherlands https://www.prepaidzero.com/netherlands-topup.html
New-Zealand https://www.prepaidzero.com/nz-topup.html
Norway See product type: Europe (All of Europe)
Portugal See product type: Europe (All of Europe)
Russia https://www.prepaidzero.com/russia-topup.html
Spain See product type: Europe (All of Europe)
Sweden See product type: Europe (All of Europe)
Switzerland See product type: Europe (All of Europe)
United Kingdom See product type: Europe (All of Europe)
United States https://www.prepaidzero.com/product/recharge-usa-sim-card/
World https://www.prepaidzero.com/world-topup.html