Hi Mrs B, The dongle you have from a couple of years ago will be no good now, as I believe if not used for a while they take you of the system and also they upgrade every now and then so they are compatible with new computers systems, I-e an old dongle might be ok for windows 98, vista but not windows 7 etc, with reference to hours usage, its not how many hours you use, its the 4 gb you use. for example when I use mine for just e-mails banking etc, forums, it will last the full package you choose, you mentioned talking to your children, if you are using Skype that will use some of your gb too. there is of course no reason why, when you go to turcell shop you cant take your old one with you and ask if you are still registered with them if you are, you will then only need to buy a new one (maybe) and not go through the whole procedure of showing passport, parents names, next of kin etc. price for new dongle, sim card, and 1st months 4gb usage is appox 130 lira. hope this helps, regards Des.