Arrival at Nairobi International Airport in Hanoi at 5:30 AM, I switched on my phone and My Idea sim was catching Viettel Provider's network and incoming messages were on.
Head to the Visa on Arrival area. Here you need to fill your form for Visa on Arrival, just some basic details and hand over to a counter all the documents - Photograph, Filled Visa form, Visa Authorization letter and your Passport. Sit and wait for some time, they will call your name and display your photo on a television screen. Go there with 25 USD in cash, they'll handover you the passport with stamped Visa with a one month Validity and you're good to go for immigration.
Immigration official did not ask me a single question. This lady just took my passport and stamped the visa for entire one month period.
Approx Exchange Rate:
1000 Vietnamese Dong VND: 3 Indian Rupees INR
The denomination in Vietnam is as below:
1000, 2000, 5000, 10000, 20000, 50000, 100000, 500000 and 1000000.
1 mn VND = 3000 INRI