Vietnam eSIM for a 5-day trip based in one city

How much data 5 days in Vietnam takes

What five days in one city looks like

Most Thai five-day trips do not cross regions. You fly straight into Da Nang or Hanoi and stay until the flight home. Da Nang is a popular base because Hoi An, Hue or Ba Na Hills work as day trips, while Hanoi suits people who want to eat and wander the Old Quarter with a single run out to Ninh Binh or Ha Long.

The advantage of staying put is that data use is predictable. You have hotel Wi-Fi every night, and by day you open maps, call Grab and take photos, so the normal figure of 6 GB over five days is sensible. Mobile coverage in Vietnam's big cities is fairly good, and the main variable is how much you lean on mobile data during the day.

Where data spikes and where it drops

• Day trip to Hoi An or Hue: Grab both ways, navigation, and videos of the lantern evening. With no Wi-Fi in between this is your heaviest day.
• Café and wandering days in town: mostly on café Wi-Fi, so mobile data is just maps and chat.
• Mountain or beach days such as Ba Na Hills or My Khe: signal on the cable car and summit is uneven, so download offline maps first.
• First and last days: you need data to call Grab from the airport on arrival and to check in online on departure. Both moments matter even though the volume is small.

Which plan shape fits five days in Vietnam

The fixed Vietnam plans we sell run for 7, 15, 30 and 180 days. The 7-day ones are only 500 MB and 1 GB, which suits someone who really lives on Wi-Fi. At a normal 6 GB over five days they will not be enough, so look at the 15-day plan (3 GB) or the 30-day plans at 5 GB and 10 GB, where you waste validity you do not need but get a big allowance to spend as you like.

Daily plans fit five days in one city best. They run from 500 MB to 10 GB per day, so you can pick one near 900 MB a day, which means the 1 GB per day tier, and pay only for the days you travel with no leftover validity. The trade-off is that the allowance does not roll over, so a quiet day does not cover a heavy one. Check the speed after the allowance on the plan page: some versions cap at 512 Kbps, others at 1 Mbps.

Connectivity facts for Vietnam

The networks behind the Vietnam plans are Viettel Mobile, MobiFone and Vinaphone, the main operators in the country. Cities such as Da Nang, Hoi An, Hanoi and Ho Chi Minh City are well covered, though signal can be weak deep in alleys or in some hotel basements, and switching to room Wi-Fi is normal.

Grab is widely used in Vietnam's big cities and is the app Thai travellers lean on most. Google Maps works as normal, and Zalo is the chat app that locals, hosts and drivers use a lot, so a host may ask you to message on Zalo at check-in. Local e-wallets are mostly tied to a Vietnamese number and bank account, so plan to pay by card or cash.

• Install the eSIM at home on Wi-Fi before you fly, but switch it on only once you reach Vietnam.
• Set mobile data to the eSIM and turn off data roaming on the Thai SIM so nothing roams by accident.
• Download offline maps for the city and the day-trip route before heading into hills.
• Save the hotel name and address as a screenshot or in Vietnamese for drivers.