Solved! Unfortunately the process com.android.phone has stopped

Solution
Here's the tips to solve your problem!

Method 1. Clear Cache on an Android device
If your device is Android 4.2 or above, this method will work for you (on older versions you might have to clear the cache on each app individually).

1. Go to Settings and select Storage

2. Choose “Cached Data” – select this option and a pop up will appear, confirming that you want to clear the cache. Select “OK” and the problem should be solved!

Method 2: Clear Cache and Data on your Phone’s Apps
Here is another great method that should work for this problem.

1. Go to Settings> All Apps

2. Scroll down and select ‘Phone’

3. Select this, and then tap "Clear Cache"

4. If this doesn’t work, repeat the process but also include "Clear Data"

Restart...
Sep 2, 2018
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Here's the tips to solve your problem!

Method 1. Clear Cache on an Android device
If your device is Android 4.2 or above, this method will work for you (on older versions you might have to clear the cache on each app individually).

1. Go to Settings and select Storage

2. Choose “Cached Data” – select this option and a pop up will appear, confirming that you want to clear the cache. Select “OK” and the problem should be solved!

Method 2: Clear Cache and Data on your Phone’s Apps
Here is another great method that should work for this problem.

1. Go to Settings> All Apps

2. Scroll down and select ‘Phone’

3. Select this, and then tap "Clear Cache"

4. If this doesn’t work, repeat the process but also include "Clear Data"

Restart your device and the problem should be solved.

Method 3: Clear Cache and Data on the SIM Toolkit
For this method, simply follow the steps detailed in Method Two, but select SIM Tool Kit from the options. Choose this option and clear cache, as in Step 3 above.

Method 4 – A Factory or ‘Hard’ Reset
If the above methods fail, you might need to complete a factory reset. If this is the case, it is more important than ever than you ensure that your data is properly backed up with the
 
Solution

rgd1101

Don't
Moderator


don't plagiarize, cite the source https://www.quora.com/How-can-I-solve-Unfortunately-System-UI-has-stopped-and-Unfortunately-Gallery-has-stopped-messages-on-a-Samsung-S4-after-I-upgraded-from-Android-4-4-2-to-5-0-1