Roaming vs eSIM
ReadyRoam Asia is S$18 for 6GB across 30 days covering Japan, and some SIM Only plans include it free, per singtel.com, checked late September 2026. This one is a real contest.
ReadyRoam Asia: S$18 for 6GB, valid 30 days, with Japan in its Asia zone. Buy a second pack within the window and past 12GB data goes unlimited. Some SIM Only tiers include Roam Asia at no charge, per singtel.com. A DataRoam Unlimited day option starts at S$19 per day.
Our 10GB across 30 days runs $14.55, the live catalog checked October 22, 2026: more data for similar money, on a named KDDI line. ReadyRoam answers with multi-country coverage and zero setup on your existing number. If your plan includes Roam Asia free, use it and spend nothing; we would.
ReadyRoam: multi-stop Asia trips, included-free plans, no install. The eSIM: single-country Japan trips wanting more data or unlimited, prepaid users, phones on other carriers, and anyone who wants the network named and the throttle rule printed before paying.
Whichever carries data, keep the other line's data roaming off so nothing double-bills, and install before you fly. The two-minute guide below covers dual SIM on iPhone and Android.
ReadyRoam Asia is S$18 for 6GB across 30 days; unlimited daily roaming starts at S$19 per day. Some SIM Only plans include Roam Asia free.
6GB covers a light week. Two weeks of maps, photos and video usually wants 8 to 14GB, where a 10GB or 20GB eSIM fits better.
Yes, on any unlocked eSIM phone, prepaid or postpaid. The eSIM carries data while the Singtel line stays reachable with its data roaming off.
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