Samsung is rolling out June update to its devices, that’s why T-Mobile bonded Galaxy S8 and Galaxy S8 Plus are now started to receiving June 2018 Security Patch. T-Mobile Galaxy S8, S8 Plus getting June security patch.
The June 2018 update brings a bunch of security fixes, alongside certain Samsung-specific patches as well.
The software version for Galaxy S8 and Galaxy S8 Plus are G950USQU4CRE9 and G955USQU4CRE9 respectively. To download this update manually, open the phone’s settings, navigate to and tap Software update, then tap Download updates manually.