JamboSim

JamboSim operates on a wallet model, letting you buy data as you need it across 200+ countries. There's no plan expiration hanging over you, and per-gigabyte pricing is competitive against fixed plans when you don't need large volumes. The app keeps your balance visible and lets you top up in seconds.

This approach suits travelers who take multiple short trips per year and don't want unused data going to waste. You'll pay only for what you use, and the per-gig rates stay reasonable compared to traditional roaming. JamboSim's simplicity appeals to people who don't want to calculate whether a 1GB or 2GB plan makes sense.