BBM Android and iPhone Message “Temporary BBM Server Error”

After installation the BBM app was running fine, then it started giving me an error message “Temporary BBM Server Has Occurred” or “Temporary Server Error”. You might be getting notifications when contacts adds you, and then you get the error when launching the app

Solution:
Be Patient! Hold tight for now, BlackBerry servers are still having problems signing up so many people. BlackBerry has said that more than 6 million people have signed up for information on BBM.com

Some iPhone users are reporting success in sending and receiving messages, others get the screenshot below: