Probably we won't be able to put the free data on hold and then take on unlimited data for a while, with the intention to reactivate the free data after the one week has finished. Doubt we will be given that luxury. So perhaps we'd better finish up the free data first and then only subscribe to the unlimited data, otherwise the free data might just get finished up during that subscribed week.

koja6049, if you still can't make and receive calls and sms, take fruitie's advice and check if you have set your card to 4G only. In some phones, the calls and sms will only work if you set it to this opotion: 4G preferable (3G,2G..).