Each message delivered to each group member costs one credit, no matter where you are. We now accept US credit cards, so when you’ve used up your free credits, you can top up easily.

The cost of sending a message TO your ZygoHub number depends on your network operator - the Hub numbers are UK numbers at the moment so some operators may charge you extra for sending an international SMS.

If you have a US or Canadian mobile number, we advise you to set up your group and test it using the free trial messages before buying any Zygo credits: we have had some difficulty delivering messages to some US and Canadian CDMA networks. We are looking into a solution to this.