Always keep 39 units available on your SIM card to pay the annual fee when it's due, and always make a call or recharge every 12 months.
Thuraya charge a fee each year on the anniversary of your SIM activation date. For Thuraya Prepaid NOVA and Thuraya Prepay SIM cards this fee is 39 units. These are the most common types of SIM cards in use, but if you have a different type you should contact the service provider who issued the SIM card to get the specific details from them.
If your SIM card has been inactive for more than 12 months, Thuraya will charge you a 19 unit fee each month. To avoid this fee, just make a recharge or a call once every 12 months.
If you don't have enough credit in your prepaid SIM account balance when your annual fee is due, your SIM card will enter a 90 day grace period where you will be able to receive calls, but not make them. During this time you can recharge and Thuraya will then automatically deduct the fee, giving you another 12 months validity on your SIM card.
If you don't recharge within the 90 day period, then you will need to contact your Thuraya Service Provider who supplied the SIM card, to request that they reactivate the SIM card. A reactivation fee applies, and is payable directly to them.