SIM Cards & Data

Staying connected between Asia and South Africa — which SIM to get, where to get it, and what works in transit hubs.

Your origin country

Vietnam

Best local SIMs: Viettel, Vinaphone, Mobifone

Cost: 100,000–300,000 VND/month for unlimited data

Get it: Any phone shop, convenience store, or airport arrivals hall. Show passport. SIM active within minutes.

For the trip home: Top up with a travel data pack before departure — Viettel offers international roaming add-ons. Most expats switch to an eSIM for the transit days.

Thailand

Best local SIMs: AIS, DTAC (now True Move H), TrueMove H

Cost: 300–600 THB/month for unlimited data

Get it: 7-Eleven, airport counters. AIS tourist SIMs available on arrival at Suvarnabhumi (BKK) and Don Mueang (DMK).

For the trip home: AIS offers multi-country Asia SIMs that work well for transit days through Singapore or Hong Kong.

Cambodia

Best local SIMs: Cellcard, Smart, Metfone

Cost: ~$5–10/month for data plans

Get it: Airport on arrival, convenience stores, phone shops. USD and KHR both accepted.

For the trip home: Pick up an eSIM for transit days — Cambodian SIMs have limited international roaming.

eSIM for transit days

Recommended

If your phone supports eSIM (most phones from 2020 onwards), activate a travel eSIM before you leave. Keep your local SIM active for receiving calls and use the eSIM for data through transit hubs and while in South Africa.

Airalo

Marketplace for regional and country eSIMs. "Asia" regional eSIM covers Vietnam, Thailand, Singapore, Hong Kong and more. From USD$6/7 days.

Nomad

Clean app, good coverage. Popular with South African expats specifically. Regional Asia and Africa packs available.

Holafly

Unlimited data plans. Good for longer trips in South Africa where you need data for WhatsApp, Google Maps, etc. Covered in ZA.

South Africa local SIM

Vodacom, MTN, and Telkom all sell prepaid SIMs at OR Tambo, Cape Town International, and King Shaka. Useful if staying 2+ weeks.

WiFi at major transit hubs

SIN

Singapore Changi

Free unlimited WiFi. Login with phone number (any number). Fastest airport WiFi in Asia — consistently excellent.

DXB

Dubai DXB

Free WiFi available (UAE Pass or phone number login). Speed is decent but inconsistent. Emirates Lounge users get better connectivity.

DOH

Doha Hamad

Free WiFi throughout. Login with email. Reliable — Qatar invested heavily in terminal connectivity for the World Cup infrastructure.

HKG

Hong Kong

Free Airport WiFi. Very fast. Also has free local SIM kiosks near arrivals — grab a 3-day local SIM for longer layovers.

KUL

Kuala Lumpur KLIA

Free WiFi. KLIA2 (budget terminal) also has free WiFi. Maxis and Celcom SIM counters at arrivals for longer layovers.

NBO

Nairobi JKIA

Free WiFi available but speed can be slow. Kenya is a great place to pick up an eSIM — Safaricom coverage is excellent countrywide.

Connectivity in South Africa

Prepaid SIM on arrival

Vodacom and MTN counters are available at OR Tambo (JNB), Cape Town International (CPT), and King Shaka (DUR). RICA registration (show passport) takes 5 minutes. Data bundles: 10GB for around R150.

eSIM works well

Holafly's South Africa eSIM provides good coverage via the Vodacom network. Activate before you land — useful for the first few hours while getting a local SIM.

Load shedding affects data

During load shedding, cell towers run on battery backup which can degrade signal quality. Download offline maps before travelling to townships or rural areas.

WhatsApp is the primary communication tool

Almost all SA communication (family, transport, accommodation) happens on WhatsApp. Ensure your SA WhatsApp number is active and receiving messages before you arrive.