Originally Posted by
tentseller
I have used WhatsApp with the same handset in the following countries with local SIM or a regional multi-country SIM within the last three months, It was seamless. Pop the SIM in, maybe change APN and full WhatsApp functionality.
Hong Kong, Philippines, Vietnam, Thailand, Malaysia, Singapore, Indonesia, Taiwan, Japan, S Korea, Canada, US, UK
Good to know - lucky I didn't have to change apn - if you did what apn did u use (or was that sim specific)?