I have now exchanged a few emails with Jajah customer support and as a result  my connection has been reinstated. I would still be interested to hear of othee people's experience with the service.

Further clarification abut Jajah... you have to find things out the hard way with them..
1.Even if your "free call" doesn't connect, ie. no reply or engaged  ., minutes are taken off your free time(60 min per day) 2. If you use their ring back option there is a charge whether or not there is a reply!
If you intend to use this "free service" between registered users you should always check that it says  however many free minutes to the left of the call button and also check your credit( top right hand corner) They give you some 34-36 pence credit when you register. If you follow my guide lines that credit should remain intact. If it falls below a certain amount they will not let you use the service without some form of prepayment.
That said it remains a useful service for calling frequently called numbers especially if they are overseas.

Hi,
I had great experience with JaJah. The advantage to skype or other voip providers is that the other person does not have to be online and you do not have to use a headset. It is totally free if both parties are registered and use the service at least once in a month. I even initiate the calls using internet on my mobile. Jajah rocks.

Also Rebtel is cool to call cheap from one Mobile to another. It sounds mega complicated but once you did it you save massive. I call from the UK to abroad. First I registered with Rebtel - then I entered some phone numbers from my phone book (Austria, Denmark, Germany, Poland etc) and received local London phone numbers for them. When I call a foreign mobile they see a local number (vienna, Copenhagen, Berlin or Warswa) If I ask them to call back whilst I wait on the line the call is totally free. I pay to London the other person pays to his nearest city (usually included in free airtime) and rebtel does not charge.. Have a look yourself http://www.rebtel.com

Also if you like calling from a computer http://messenger.yahoo.com/webmessengerpromo.php is a lot cheaper then skype...

Hope this helps
André

Jajah can be very confusing.
1.If  the line you call is busy you will be given the option of automatically rescheduling the call after 5 , 10, 15 minutes. If you accept to do this you will be charged and once your credit balance, which is given to you when you sign on, goes below a certain amount you will no longer be able to make free calls without making a payment)
2.You start off with an allowance of 500 free minute a month but as soon as you use 120 minutes i a month your allowance is cut to 30 min a week or 60 min a month.If you use 30 minutes in a week you will only get 30 minutes for the rest of the month. They say that as soon as you make a paymnet your 500 free minutes will be restored.
It seems to me that they haven't got their act together but the customer support people do respond to emails and very gradually one learns how it all works. I use it mainly to allow my daughter who lives overseas and doesn't have the benefit of 18185 to call me for free.
3 I forgot to say that when you make a call and don't actually connect, ie line is engaged or no one replies it uses one of your free minutes.