KnowRoaming

KnowRoaming offers the largest network coverage claim in the eSIM space, with access to 800+ carriers globally including all major Thai operators. The platform includes a free 1GB trial for first-time users, letting you test coverage and speeds before committing. Plans include data-only, voice, and SMS options with flexible daily or monthly billing.

Works well for long-term travelers or those making multiple short trips across 50+ countries, since one eSIM handles most destinations. The trial period removes purchase risk, though prices sit mid-range and customer reviews mention occasional speed variability during peak hours in Bangkok.