unfortunately t mobile has stopped

DIY REPAIR HERE: first to repair this, you need to understand what is happening. T-Mobile has launched an update to their T-Mobile app that is incompatable with phones running less than 6.0 Android operating systems. Instead of being an update, their new app is designed to act as Malware that freezes your phone with that annoying pop-up. For a phone that was not originally a T-Mobile phone, go to the Google Play Store, click on the red circle up top to pull up your apps. Go to "manage apps and device." Go to "manage" up top next screen. This will bring up a list of your apps. Scroll down to T-Mobile, click on it. You should be able to uninstall it. If you can not, then it means you have a phone where the T-mobile app was part of the factory installation package. You can't remove it, but you can stop it from making the pop-ups. So to do this, go back into "settings," and go to "system" click on it. Go to "system developer options" click on it. scroll down to "background process limit," click on it. A sub menu will pop up asking you how many processes you want to allow. PICK NONE. ZERO. NO BACKGROUND PROCESSES ALLOWED. This is the fix. When you toggle back to the home screen, and remove the pop-up, no more should happen. Because the pop-up is a background process and you are not allowing that process to happen. The pop-up is a Malware loop created by T-Mobile to render your phone so miserable to use....you buy a new one! Notice how nobody tells you how to fix it, but they are quick to sell you another phone. THERE IS NOTHING WRONG WITH YOUR PHONE. Once the background processes are stopped the phone works fine. Shame on you T-Mobile!!