It is widely believed that an Amaysim Interntional roaming pack has a validity of 365 days. Users of these packs who have data, minutes or SMSs remaining can extend their validity beyond the 365 days by purchasing another pack, which might even be smaller/cheaper than the original pack. Amaysim call it "stacking". It took me three phone calls to Amaysim Customer Service before I got an operator who knew about this option. I paid for a new pack in the same phone call, and my account now shows the extra data, minutes and SMSs, and a new expiry date 365 days from now. Happy!
