Here is a guide to the best Sim card data Internet providers in Thailand. Most people buy a SIM card with data preloaded for use with a portable device such as an iPhone, iPad or tablet, but not all data providers are created equally.
Thai SIM card providers
1. AIS: One-2-call: The strongest all-round coverage.
2. True Move: A good choice in cities such as Bangkok although the sim card seems to lose coverage in more remote areas.
Although as of around June 2015 True Move say they have the most complete 3G and 4G coverage in Thailand and users of their network can get 1 hour of free internet every day.
3. DTAC: Some people say that data speeds are comparative with One-2-call, whilst others say it’s a SIM card to be avoided
All operators offer 3G and 4G service and monthly 3G data plans with unlimited EDGE speeds, priced between 650 – 899 Baht.
The best data provider in Thailand is One-2-call, the provider is AIS. It’s adequate for email, Google searches, Facebook etc.
If you plan to buy a SIM card in Thailand you can do so by getting one at Bangkok airport or any 7-Eleven convenience store or mobile phone shop.
The most cost-effective data package is One-2-call AIS Unlimited priced at 800 Baht. This will last for one month and is, as the name suggests unlimited.
Be sure to ask for a recurring package and make sure the package has been activated before you leave the shop. This is easy to do as you will instantly receive a text message telling you the pack has been activated.
Beware if you do not activate the package, you will burn through your credit within 24-hours.
For tourists coming for shorter periods than one month, this is still the most cost-effective and trouble-free way to get your internet data as you will find you will run out of data quickly and the cost will mount up on smaller packages.
For those planning on staying longer than one month, you will receive a text message from the mobile phone operator before your credit is about to expire. It’s easy to top up again by going into any 7-Eleven, AIS shop or telephone provider and asking for an 800 Baht top up, then you will be good to go for another month.
Note: if 7-Eleven don’t sell an 800 Baht top up voucher just buy three 300 Baht vouchers
A One-2-call AIS SIM card is also the best choice if you are planning on doing a lot of travel within Thailand as this SIM card seems to have the strongest signal, even in more remote areas.