Why is my WIFI connection on and off on my Xperia Z3 after T-Mobile Unlocked?

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AC Question

Why is my WIFI connection on and off Xperia z3 after Tmobile Unlocked

Sony Z3: I was traveling to Europe and decided to have Tmobil Unlock my phone so I could use another carrier there! TMobil did this unlock remotely and when I arrived to my destination error every time I read or send and SMS message "Emergency call service stopped" I figure okay not a problem, I was able to send SMS messages any way. But, I was not able to connect to WIFI it connects and disconnects. I tried several WIFI locations and same problem. Back in USA...I reconnected with Tmobil but my WIFI problem continues. Done several Android RESET..Sony Resets. Problem continues. WIFI diagnostics show WIFI Passed! Phone not able to hold IP address. It last 5 secs and it disconnects and reconnects? Definitely a software glitch somewhere.