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To register for Grab in Vietnam, a local SIM card is not strictly necessary. A Russian phone number can be used for registration, with verification codes sent via WhatsApp. Alternatively, purchasing a local eSIM upon arrival is recommended for internet access and seamless Grab functionality.

To register for taxi applications in Vietnam using an eSIM without a phone number, use a standard home-country SIM card for the initial SMS verification. Once registered, the app can typically function using the active data connection from the eSIM. Ensure the app supports keeping the user logged in without requiring recurring SMS verification.

Users attempting to register for Grab in Vietnam using CIS region phone numbers may encounter an "Oops something went wrong" error, indicating potential incompatibility with non-local numbers.

Experiencing issues with MegaFon roaming in Vietnam, including inability to connect to the hotline or access the personal account due to a lack of SMS codes. Investigate potential causes and solutions for these connectivity problems.

While Russian SIM cards (MTS, Beeline) may work in Vietnam, roaming charges can be expensive. It is recommended to purchase a local SIM card upon arrival for cost-effectiveness. For urgent access or SMS verification, consider using Wi-Fi or a local SIM. Local SIM cards are inexpensive and require a passport for purchase.

Avoid domestic roaming due to high costs and content restrictions. Local SIM cards or eSIMs via travel platforms (Trip.com) are significantly cheaper and more reliable. Note that truly unlimited mobile data plans do not exist in Vietnam; beware of sales pitches claiming otherwise. Activation usually triggers upon arrival.

For reliable mobile service in Vietnam, providers like Viettel and Mobifone are popular choices. When purchasing a SIM card, consider the data plans offered and ensure they meet your connectivity needs. For receiving SMS confirmations from Russian services while abroad, international roaming on your Russian SIM card might be necessary if local SIM plans do not support this functionality.

User's question about Vietnam mobile operators is still pending. Provide information on available mobile operators, their plans, and any known issues or recommendations.

Viettel SIM cards are available in Vietnam. Prices and data packages can vary between different Viettel offices. It's recommended to check reviews and compare prices at different branches to find the best deal. One user reported getting a plan with 6GB of data per day for about 180,000 VND per month in the center of the city near a roundabout.