Why doesn't WhatsApp work on mobile data / eSIM in Nha Trang, Vietnam (but works fine on hotel WiFi)?
Based on 1 discussion with 2 participants · Last activity: 13 days ago
TL;DR
In Nha Trang, mobile networks (including roaming and eSIMs) often block or throttle WhatsApp — it only works over WiFi without a VPN, while Telegram usually needs a proxy on mobile data. Both messengers work fine over hotel WiFi.
What the community said
One traveler confirmed that on hotel WiFi both WhatsApp and Telegram work normally without a proxy or VPN — the issue is specifically with the mobile network, not the apps themselves.
15 days ago Hotel WiFi — no restrictions
Another traveler using Russian roaming, and her daughter using a Kaspersky eSIM, both had the same issue: once outside on the local 5G network, WhatsApp stops working entirely, and Telegram only opens through a proxy.
15 days ago Roaming / Kaspersky eSIM — WhatsApp fails on 5G