Bug 880395 - [leo-pre-iot-br] [SMS] [COST-CONTROL] Phantom SMS with "SALDO"
under Vivo Brazil coverage. r=borjasalguero'
Merge pull request #10578 from lodr/bug-880395-phantom-usage-sms

Bug 880395 - Check threadId for sending messages before adding them to the current thread.
r=borjasalguero