Works OK on the latest Firefox, but takes a while - you need to pause after selecting the countries so it can populate the call-type menu.

Way too expensive for calling mobiles in most cases (and when I'm travelling and using these types of sims, it's other people's mobiles I call more than fixed lines).

The rate for calling a US 800 number from the US is nearly twice the price of calling a US fixed line, which is odd.

While travelling I rarely worry too much how much it costs to call out; as long as you have the free reception of calls either enlinea or callbackworld work just fine.

I wasn't patient enough - OK, it works on my Mozilla, too :)

To all of you who have commented (and emailed)

We (Geodesa / GeoSIM) are working on the online rate calculator as "we speak". Be assured we have nothing to hide in the rates, it's just a mater of time and resources!

The www.globalsimcard.co.uk website will be updated soon with a claculator as soon as is has been fully tested and checked.

Thaks for your patience.

Ed

Yes, we have priorotised getting the calc working due to all the emails!

Patience please. :)

When I'm travelling (at an airport etc) I don't always have the time to battle with trying to get a couple of different callback companies to work and then putting up with the poor quality and lag, so being able to call out at a reasonable cost is important to me (sms even more so).

It's different if I'm in one place for a while and don't have any easy way to make long cheap phone calls to family and friends, that's when callback is handy (but even then it's rarely of a quality that is usable for business, making bookings, etc).

I've tried CBW, enlinea, and gphone - none are what I'd call acceptable quality or reliability for easy use on the road when calling back to a mobile.