Simcardo is an independent travel eSIM marketplace operated by KarmaPower s.r.o., a company based in the Czech Republic. It helps travelers compare prepaid digital data plans for destinations around the world, including country-specific, regional and multi-country options. Customers can review plan details such as listed data, validity and price before choosing a bundle; availability and terms vary by plan. Simcardo sources its offerings through global eSIM distributors and aggregators, and the plans connect through third-party mobile networks. The company is not a mobile network operator.

The service is fully digital, with no physical SIM card required. After payment and supplier provisioning, installation details are sent by email. Travelers need a compatible, carrier-unlocked eSIM device, and actual coverage, network technology and speeds depend on location, partner networks, congestion and device compatibility. Checkout is processed through Stripe, with payment methods and final prices shown at checkout. Simcardo also provides destination search, device compatibility information, customer support, and educational guides on eSIM setup, activation, roaming and troubleshooting.