Excerpt from this ITU document: VARIOUS TONES USED IN NATIONAL NETWORKS (ACCORDING TO ITU-T RECOMMENDATION E.180)(03/1998)(POSITION ON 1 FEBRUARY 2003)

and this matches the table at the end of this document from TOT

Frequency in Hz: f1×f2 = f1 is modulated by f2

Caller ID

uses V.23 modulation and is signaled by polarity reversal

I posted before what I wanted to transfer my prepaid True number to DTAC. Today I inquired again at the DTAC Support Center and was told what i can finally do it, but only at Bangkok DTAC offices. Only passport is needed and the process takes 2-3 days. No SIM replacement necessary, you will be notified by SMS when the transition is approved. So I would definitely do it when I am in BKK next time.

Thailand Street Map version 11 for Garmin GPS units is now available on the GPSSociety.com site maintained by ESRI Thailand. Original page is in Thai, follow this link to Google Translate it.

Update from CAT Telecom office – provinces where CAT CDMA services are NOT available:

1. Bangkok
2. Ang Thong
3. Kanchanaburi
4. Chanthaburi
5. Chachoengsao
6. Chonburi
7. Trat
8. Nakhon Nayok
9. Nakhon Pathom
10. Nonthaburi
11. Pathum Thani
12. Prachuap Khiri Khan
13. Prachinburi
14. Phra Nakhon Ratchasima
15. Phetchaburi
16. Rayong
17. Ratchaburi
18. Lopburi
19. Samut Prakan
20. Samut Songkhon
21. Samut Sakhon
22. Sakaeo
23. Saraburi
24. Singburi
25. Suphanburi

Ookla, the company behind speedtest.net, made it’s bandwidth statistics available. Here is the data for Thailand.

Discovered the concise article in Wikipedia about Internet in Thailand.