Hello,I am the person that will be helping you today.
In such cases, it is best to cold boot the iPhone. You can do that by pressing and holding both the Home button and the power button at the same time. Keep both buttons depressed until the iPhone resets. When it resets, let go of both buttons. When the iPhone comes back on, you may open the Wickr messenger program and it will work.
Please, let me know how that turns out for you.
I will be standing by, looking forward to your response.