Yes, this packages are valid for one year after the card is activated. After that it's like a normal prepaid sim, you can top up voice and/or data. Just not for the same prices... that's the problem. I use one card just for data as my second sim and buy a new one every year. Normally you have many month before you must activate these cards, so when you see a promotion you can buy it some month before you need it. For the net I would recommend DTAC... good coverage everywhere, good app and also good customer service.