UNISIM

UNISIM strips away the complexity with a per-kilobyte billing model across 170+ countries, deducting funds only for data you actually use. Unused balance stays on your account forever, so there's no financial penalty for taking a break from travel. The low entry cost makes it easy to test the service without committing to a large top-up.

This setup suits occasional travelers and those testing different eSIM providers before committing to a longer plan. Since every kilobyte you buy has infinite validity, you're not juggling expiration dates or watching credits vanish, a major relief for people who travel sporadically.