Be very careful of this Turkcell dongle. We purchased one of the 1st ones available when in Turkey in July, and it worked great for the 1st month. Thats when the troubles began. If you use your 4gb allowance within your month, and attempt to top up your dongle, all that will happen, is that you are purchasing extra usage for the the time left, before the ongoing monthly usage package expires, and you have to renew. In other words, this dongle you have purchased, lasts one month at a time. You then pay 49tl to again renew the contract/keep your contract number with Turkcell. If as said before you use up your 4gb usage allowance within the month, you pay additional funds via a mobile phone to (you think) top up this account. Turkcell will only allow you to renew each month, top ups are permitted, but at an extortianate rate. For example 100tl will not even last a day!! and that is with normal internet usage of 1hr per day. You have been warned.