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I confess I am not familiar with Viber, but a quick read indicates it uses your WiFi or 3G connection for VoIP calls, and it includes a messaging app (similar to Whatsapp). Now, I call that cheating, but I want to warn everybody who is using VIBER: It's not free, despite their advertisement. Although I do not use any services of AIS, although I send a text using my WiFi and Internet connection, AIS still charges 9 THB per text. So to make a long story short, VIBER is NOT free! Do not believe their advertisement. They called me back a day later and explained that AIS charges a fee 9 THB for each text sent by VIBER. I knew I had used "VIBER" a free text and VoI service. I positively knew that I had not used my phone's SMS services for these texts. There I found out that the number to which I had allegedly sent an SMS was the number of my SIL in New York Now. They sent me a code to get the invoice details on the web. I called AIS for clarification since I knew I haven't sent any such SMS abroad. I was quite surprised when I got my last AIS monthly statement charging me for what they claim have been 12 SMS to an undisclosed international number.
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