想使用NoNoh,但好像一次付费只能使用6个月，而且包括了free的120天，也就是$15要使劲打，尽量在两个月内用完，不然有可能被终止服务。
http://www.nonoh.net/en/termsofuse.html
12. Termination of the Service (Framework Agreement) by the customer
* 12.1. If the customer has not purchased any credit, he shall be able, without giving any grounds or notice, to terminate his use of the VoipSoftware by notifying Betamax of his intention either by e-Mail or by letter sent to the latter's address. Alternatively, he can notify his wish to terminate in the dedicated Betamax web portal. In all cases, this notification is to be in text form.
* 12.2. If the customer has purchased credit, the minimum duration of the present Framework Agreement shall be six months. This minimum period shall re-commence with each fresh purchase of credit. After the expiry of the minimum duration period, the customer shall be entitled to give notification of termination at any time in accordance with No. 12.1.
* 12.3. In addition, in the case of distance contracts, the customer shall be entitled to terminate the present agreement in accordance with current legal provisions, in this respect see No. 20 for details.