demark

The reason that I am so skeptical about VOIP is that these are business calls from customers and potential customers, so there's no margin for error or bad call quality. I may have to go the roaming route if nothing else.

We have a toll free number set up from which I can forward to Thai cell (Grasshopper.com)- how much is incoming call to a Thai sim from a US toll free number?

Not sure from toll free number cost but we have a permanent US number in the US from decall which cost us $1 a month calls to my Thai sim cost 2.2 cents a min. voice quality is the same as calling from a landline very clear. We also have the same set up from the UK which works perfectly.

I use Magic Jack too...I paid for 5 years upfront....was much cheaper....just make sure your internet connection is good.

I have used magicjack on wifi and its just OK

I think you can also get an app for it to and use your phone data

Sounds interesting will do some research, I know decall have local numbers in the states which they configure to call your Thai number. it cost about $1 a month and calls are charged to your decall account at about 1.5 cents a min. Voice quality is very clear with no echo or drop calls which you sometimes get with Skype.

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T-Mobile has free data roaming and is .20 for calls.

Or $15 per month for unlimited talk (even to mobile phones).

I think it is only for calling from US and wouldn't work to call from Thailand to US/

I don't think this works for calling from Thailand its only for calling from the US?

Decall can give you a Thai number but they cost about $10 a month.Cheaper to use there app and call anyone in the world at less than 2 baht a min. Unlike line the other party dont need to be on the internet it will call any normal phone anywhere on the planet.

Try DE-Call www.decall.net they have the cheapest calls using voip from mobile or landline. They also have access numbers in most countries certainly in the US. They will configure the local number so any one in the US can call the number and it will ring your Thai mobile. Calls cost about 1.5 cents approx half a Baht a min.