Error code in Windows Phone Store? Worth to know....

I'm sure that,every Windows Phone (WP) users must faced an error while downloading/updating the app through Windows Phone Store at least once (For someone who lucky enough for never facing that, I have the sample screenshot for you).

The little nightmare screen (Credit from: windowsphonedaily.com)

What is these error codes? What is the meaning of those strange characters?
From what I read and experienced, those error code are varied, it's depends on the situations and symptoms. But the point is, those code will imply us about, the error you just facing here, does it happens because of your phone went wrong? Or it because of the error on Microsoft Windows Phone Store server?

The latest outage of WP Store error happened on January 15th, 2013, the main cause of that outage is the Purchasing & Billing server of Windows Store was down on that period and the outage remained for several hours before MS can fixed it. But, on that period, some people I know, tried their best to fix this themselves, some of them try to delete the app and re-install it, some tried reboot the phone and some... tried "Hard reset" their phone (Oh! Boy). None of that worked anyway......

So, I think better we knew, what happen when we got the error message? What should be the next/best approach for that kind of error? Then, we can manage to live with our phone properly. These are the error code I faced, read and search from several sources, hope it will be helpful.
** Sometimes, the code you get may different from my list. If you couldn't find the exactly matched code, try to look at the code with at least first 5-6 digits matched with your code. Sometimes, those error are related**

Windows Store error code.

Error code: c101a006, c101a007, 805a01F4 หรือ 805a01F7
Symptom: The problem with  MS Purchasing & Billing server. This will affect the paid app and free app which you already downloaded (already in your purchased history) before the error occurs. Sometimes, you will be able to download new free app (which you never download it before)
Possible solution: Wait (yes, just wait) for MS to fix.

Error code: c101abb9
Symptom: WP Store down or closed for maintenance.
Possible solution: Wait for MS to fix.

Error code: c101a7d1
Symptom: Invalid content license, you will face this while updating the app.
Possible solution: Cancel the update, Uninstall that app and re-install it from the Store. (you'll get the latest version automatically)

Error code: 805ab406
Symptom: Incomplete MS Account Profile.
Possible solution: Go to this site: Microsoft account (aka. Windows Live ID), then click on "Edit personal info" and edit your date of birth, country/regional and save the changes you just made. Then, back to your WP and try download/update your app again (Info from Nokia Forums)

Error code: 805a0193
Symptom: The problem with your Wi-Fi Network 
Possible solution: Change your network group or switch to your cellular data.

Error code: 80004003
Symptom: This is quite serious error code and I can't find the proper/accurate info about this error. What I know is, this error will happen while you try to update your app. Some people may face this error for days or weeks without the fix. But for some people, this error will gone itself when the time pass.
Solution: Regarding to the info from MS Forums: They suggest to;
- Uninstall the app you facing the error
- Re-install the app from WP Store. (Some case can be solved with this method)
- If the issue still remains, wait for 2-3 days and try to update the app again.
- If those methods don't work. You may need to "Hard reset" you WP.

Error code: 80048264
Symptom: This error code also one of the serious issue. You will face this issue if you didn't register with WP Store with your MS account in the firsts time you activate your WP (you choose "Skip" on the "Register" screen). Then, when you want to download/update any app, you may face this error.
Solution: From MS Forums: The best solution is, hard reset your phone and do register with MS account while you activating your phone.

Error code on your WP apart from in Windows Store.

Error code: 80048869
Symptom: You may face this error while you want to start playing the music in "Music Hub"
Possible solution: This error because the incorrect date/time setting in your WP. Try resetting them from "Settings --> date + time" then, reboot your phone or soft reset it (Press and hold "Volumn down + Power" for 10 seconds till your phone vibrate and release them).

More code will update here.