After the free trial period is over, we understand that you might need some time to decide whether or not you want to subscribe to our service. This is why we reserve your Ninja phone number for 30 days in order to allow you some time. What this means is that nobody else can use your phone number, except you.
However, if you have exceeded the 30 days without upgrading to a paid plan, we will no longer reserve your phone number and it will then be released back into inventory for another customer to use.