Twenty countries, and the spread runs wider than most Asia plans. It reaches from Japan and South Korea through Southeast Asia to Australia and New Zealand, then adds India, Pakistan and Sri Lanka, and stretches west into Israel, Kuwait and Saudi Arabia.
The full list is Australia, Cambodia, China, Hong Kong, India, Indonesia, Israel, Japan, Kuwait, Macau, Malaysia, New Zealand, Pakistan, Philippines, Saudi Arabia, Singapore, South Korea, Sri Lanka, Thailand and Vietnam. Mainland China, Hong Kong and Macau are three separate entries with three separate host networks. Only seven of the twenty sit in Southeast Asia, so Laos, Myanmar and Brunei fall outside.
Now the gap that catches people out. Taiwan is not covered. Most rival Asia plans do include it, so a Tokyo to Taipei hop that works on someone else's eSIM will not work on this one. Also absent are Nepal, Bangladesh, the Maldives, Mongolia, Fiji, the UAE and Qatar. The subcontinent is the reverse case. India, Pakistan and Sri Lanka get left out of Asia wide plans all the time, and all three are on this one.