For now I'm using SMS go pro, but I'd like to know why this happened. I read something about accessing a hidden testing menu (*#*#4636#*#*) to change the smsc but that menu is not available on my phone (any idea why?) tried the code above and tried using those apps that serve as a shortcut. The screen goes dark as it's trying to access the testing menu and returns to home screen, in other apps (like missing shortcuts) it shows as unavailable. I even edited the hiddenmenu file on efs/carrier from OFF to ON and still the testing menu doesn't appear. I'm using my phone right now with mobile data, wifi works well and so do phone calls, no problems at all.
I'd really appreciate any ideas that could help me. My phone is a Samsung Galaxy S3 I9300 running 4.3 firmware, I updated from 4.1.2 a couple of days ago but didn't have any problems, I could receive sms normally. The problem happened suddenly yesterday night.
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