When the 10GB is used up, or after 30 days, data stops. The days start when it first connects at your destination, so you can buy and install it before you go. Use it within 180 days of buying.
Bangladesh: Grameenphone 4G, Banglalink 4G, Robi 4G · Cambodia: Metfone 4G, Cellcard 4G · Hong Kong (China): csl 5G, SmarTone 5G · India: AirTel 5G · Indonesia: Telkomsel 5G, XL 4G, Indosat 5G · Japan: KDDI/au 5G, SoftBank 5G · Laos: Lao Telecom 5G · Macao (China): CTM 5G · Malaysia: Maxis 5G, CelcomDigi 5G · Philippines: SMART 5G, Globe 5G · South Korea: SKTelecom 5G, LG Uplus 5G · Taiwan (China): Chunghwa 5G, Taiwan Mobile 5G · Thailand: AIS 5G, DTAC 5G, TrueMove H 5G · Vietnam: Viettel Mobile 5G, Vinaphone 5G, MobiFone 5G
