Can I use a local Vietnamese SIM for data while keeping my home SIM for SMS in a dual-SIM phone?
Based on 1 discussion with 3 participants · Last activity: 24 days ago
TL;DR
Yes, in a dual-SIM phone you can use a local Vietnamese SIM for mobile data while your home SIM receives SMS for free — just make sure to disable data roaming on your home SIM before arrival.
What the community said
With a dual-SIM phone, simply buy a local Vietnamese SIM on arrival and use it for mobile data. Your home SIM will continue to receive SMS for free as long as data roaming is disabled on it. No extra phone settings are needed — everything is managed through your home carrier's app or account.
24 days ago
Before your trip, take these steps on your home SIM: disable mobile data roaming, set apps to update only on Wi-Fi, and turn off voicemail/auto-answer so incoming calls don't trigger roaming charges. After that, you can freely use your Vietnamese SIM for data without surprise bills.
24 days ago Disable data roaming via carrier app
Vietnamese SIM cards with data are sold at Cam Ranh Airport and at numerous phone shops throughout Nha Trang. Popular carriers include Viettel, Vinaphone, and Mobifone. Just insert the SIM and data works immediately — no need to visit a service center for setup.
24 days ago Viettel, Vinaphone, Mobifone — Cam Ranh Airport