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I found it and it was a triple tap.
It seems you are correct. The question is, why?Through most of my experience and in this forum, unlocked non branded phones usually can't use wifi calling on T-Mobile. I don't use prepaid so I can't speak for that because it's been about 6 years since I used Tmobile prepaid

It's OK then, just uninstall it. No damage is done.
so lets first rule out a nefarious app that might have been installed. i would put the phone in safe mode. it is usually a combo of power and volume (it will vary according to models and manufacturers). this prevents any 3rd party apps from running. if it is still happening then i would do a factory reset.Hey, the phone I've been using have started to get a black screen and get glitches across the screen. Right now it's in a whole black mode where I can't see anything, it doesn't react if I hold any of the buttons and all I see is some glitches. And if it does turn on it will only be on for a few seconds then it will become black again. I wonder if it will help if I reset it or is it a matter of the hardware?
Over-time the charge socket have been getting damp a lot and if this may have been the effects and it's actually the hardware, may be possible? Thanks if answer.
Heyy.. that really worked. Thank you so muchTry using the Play Store app to reinstall those now greyed-out apps. There's a good chance that the saved data for each of those apps still reside in their respective folders in the internal storage. (When you're 'moving' apps to an microSD card, it's still matter where not everything relative to the app gets moved over. It's actually a situation where parts of the app have to remain in the internal storage while other parts reside on the card.)
This same situation occurs if you've forgotten that you've moved some apps to your card and later remove the card. The apps in question need to be reinstalled to function again because parts of them are no longer accessible.
As to why you're having this problem after rebooting, how did you 'move' those apps? Using the Settings menu in your phone or using a third-party app you installed?
https://play.google.com/store/apps/details?id=com.mobond.mindicator&hl=en_US
https://play.google.com/store/apps/details?id=com.intsig.camscanner&hl=en_US
https://play.google.com/store/apps/details?id=com.mobisystems.office&hl=en_US
https://play.google.com/store/apps/details?id=com.thinkyeah.galleryvault&hl=en_US
Snapseed
Hangouts dialer?I have problems sending & receiving calls on my cell phone from inside my home (Aluminum siding exterior). Things are fine outside and in other buildings. My carrier says that nothing can be done from their end.
Someone suggested that using ‘wifi calling’ (with my present phone #) on my home’s wireless network while indoors as a possible solution. Can this be used for this purpose? If so, how? I do not see the settings on my phone to enable it.
John
Sony Experia E5 F3313
Android 6.0

Thanks for the answer...I have never heard of this app before.I figured it out. Its Voxer
Ok, thanks. I try that.You have to be running 4.4.2 or flash 4.4.2 firmware. If you flash 4.4.2 firmware you can then install Philz Cwm and a custom rom that will bring you up to 5.X +