The faster connectivity will enable mobile devices like smartphones and tablets, as well as other internet-connected devices, to access and run more apps on the cloud. This frees up the device memory which might otherwise have been taken up by installing apps on the device. 

Being able to run multiple cloud-based apps simultaneously will be another plus, since your device CPU now has to do much less of the "heavy-lifting." This will improve productivity, efficiency and  the user experience.

EXAMPLE. While there are many existing apps that can benefit from the speed boost, and many future apps that shall run on the faster speeds, I can imagine the high bandwidth being particularly useful *every day* for anti-malware apps. The anti-malware software on the mobile device can even use a dedicated channel to exchange information with central servers, to always stay updated, to seamlessly upload any suspicious code to a central server (example Virustotal ) that can test that upload with *multiple* antivirus engines, i.e. the mobile device can now have the protection of multiple anti-malware solutions while running just one good antimalware app - thanks to the advantage of faster 5G and cloud computing.