Btw, direct outgoing calls blocked on all International SIM cards, because they use callback method instead.

If you see such message like "outgoing calls barred" possible it means that your handset is not compatible with SIM application, I can suggest to use another handset,
or dial via *146*00CountryCodeNumber#.

Also good idea to ask from support(c)travelsim.com, may be your SIM just expired.

We haven't tried that since we've only been in countries where direct calling is supported and that doesn't work.

New voice with Travelsim? When I call my cards I hear from an english voice, not estonian anymore:)

yep, this is good :)

Our three Travelsim card still doesn't work correctly.

3 months ago I suggest you to ask the support(c)travelsim.com, looks you still not ask :)

My Travelsim card (airbaltic) works pretty good, I used it some days ago in Turkey, registered in Turkcel network.

??? Why do you think we didn't ask? What are you looking at to see that?

We got the answer that "oh yes it should work, we can't see any problems". Not a very creative answer to us.

We have other SIM card soultions, so we just test the cards every now and then to see if they work, and they don't.