Coming in Blitz update 3.6, the following changes to communications will be made:
– Players will no longer be able to communicate with the enemy team.
– Communication with allies will only be possible so long as your tank is alive.
– Platoon chat and training room chat will remain unaffected.
The Blitz devs justify these changes for the same reason cross team chat was removed on PC, denying toxic players chances to give away allied positions to the enemy and to cut down on toxic behavior.