It depends! Most of our SIMs are provided by large local operators, and you should be able to find top up vouchers locally in shops, kiosks, corner stores, etc. Your SIM is a regular pre-paid SIM so you can top up without problem.
You can also purchase top ups directly from us online!
Data only SIMs are generally only valid for the amount of data allocated (1GB, 10GB, etc) and cannot be topped up. Countries where you cannot top up a data SIM include Canada, Japan, Spain, US, Denmark, Hong Kong, Ireland, Italy and Austria. We recommend instead that you purchase multiple data SIMs for these destinations, if you think you will need more than the data amount provided.