Hello,
Can you provide a little more info about what happened please?
IE. After unlocking + debranding your phone, did it work? And what exactly happened "yesterday"?
I ask because I'd like to know if it EVER worked or not.
Is your SIM card okay? Does it work in other phones?(did you pay your bills on time?? :p )
Please try to provide enough info so that those who look into this have some info to work with.
Best of luck, and have a nice evening! :)