IBM published this Technote which lays it all out in black and white:
This is not about IBM Connections Cloud users but is about on-premises installations of IBM Notes Traveler.
As the Technote states:
In the coming months, IBM will be enhancing the IBM Verse for iOS, IBM Verse for Android, IBM Notes Traveler Companion and IBM Notes Traveler To Do mobile apps to require that a secure connection be used between the mobile app and the endpoint used for connecting to the IBM Traveler server.
The gist of it is, without HTTPS and valid SSL certificates you will lose your connectivity.
Please read the Technote for all the details and plan accordingly if you have yet to setup your SSL certificates.
If you need help, just ask.