It shows "For SMS reminders, please enter the Email to SMS gateway address provided by your carrier. Keep in mind that you are 100% responsible for any fees charged by your carrier for receiving SMS messages. For this reason, you may want to set a daily limit."
While in China there is no such thing, that means Chinese users cannot use toodledo ams reminders any more.
I was not aware that Chinese users do not have Email to SMS gateways. If this is correct then you will not be able to get SMS alarms. You can still get email, twitter and iOS push alarms. We will look into other methods for getting alarms in the future. Sorry for the inconvenience.