I'm planning on spending some time traveling around Thailand and wanted to know if anyone can advise on what's the best mobile phone coverage throughout the country. I'm going to get a new Sim card with a 3 or 4G internet package for emails, Line, WhatsApp etc...can anyone advise what company would be best please?

Many thanks.

True move cover most parts of the country

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AIS has the best 4G coverage in Thailand and highest data speeds. With the right data package, you also get free access to AIS wifi hotspots located in the shopping malls, Big C, etc throughout Thailand and BTS in Bangkok. True is a close second. DTAC comes in last.

Just made a trip from Sukothai to Chiang Mai, lots of dead areas on the route, I have True.  Wife has AIS but unfortunately didn't do a comparison, but think she had better coverage.

I'd gamble with AIS if I were the OP.

AIS all the way

It's a toss-up; you'll get anecdotal evidence from subscribers to each of the networks saying theirs is the best coverage, but fact is they are all patchy to some degree, and much of a muchness overall. If being online as much as possible is essential, use a two-SIM phone and subscribe to two services - or even two two-SIM phones and four services.

I have had AIS for 15 years with no complaints. Competitive rates and no hassles.

Many thanks to everyone who replied...very much appreciated.

I have 2 sim, true for the Internet as in my opinion a lot better &  cheaper & ais for phone calls ie international calls as 005 then country code 

Given that prepaid plans offered by all the carriers is dirt cheap you could get both a True & AIS sim and depending on the area use the one with service... 

 

I would get a True as the main sim and AIS as a backup... With either prepaid sim you cam buy a monthly data package or a weekly or just one day upof data for a low price...

Had True for 1 year then switched to AIS. Much better coverage from AIS. True is fine in or near cities but in the sticks AIS is better