Oh my god. I tried every which way but loose to fix this problem and I did it without the help of 3 Virgin Mobile technical support representatives, one who actually hung up on me after 31 minutes of waiting ''due to heavy call volumes''. I'm going to set this up by covering that the people at Virgin Mobile actually had me reset the phone without I might add mentioning I should back up my data, of which I already did vie Samsung Kies.
Ok, first of my phone is a Samsung Galaxy Reverb (M950), so this might not work for you, but what can I say but It worked for me and you may want to try it if you keep getting the #128 Login Failure: Unknown Error.
Samsung, rather Virgin Mobile actually tried to convince me to hold off because other people were receiving the same error and a supposed fix was coming, and that actually after asking If I should just send it in to get fixed. That was something they were willing to do, but you know how people are.
Like I said I tried everything, Including deleting all the apps, I had and clearing the cache of every system app. Re-entering the MSID and MSN numbers via ##847446#, replacing them with ten 0's as suggested and then, re-entering the numbers, taking out the battery etc. Nothing.
The only thing that seemed to work for me and erase the issue was to go to SETTINGS , Then go to DATA USAGE, Uncheck Mobile Data, UNCHECK ''SET MOBILE DATA LIMIT'', exit, then while powering off the phone TURN OFF ''DATA NETWORK MODE'' from the power button and rebooting the phone.
Once this was done, again for me, after a few tests to make sure this was the problem, I turned all of those features BACK ON and the problem vanished.
If this does not seem to work for you, try it again, but I'm just going to mention, I also happened to download an app called ''My Data Manager'' from Google play, thinking it would reset/replace the corrupt/missing data files if I played around with the program a little.
I have no idea if that program had anything to do with resolving this issue, but I no longer have this issue and since I went through such great lengths to find the problem and did, I felt for other users who may be having the same problem who were as picky as me about it showing up as randomly as it had.
Good luck...
Update. As close as I can see this problem seems to arise from one of the apps that connect through the DATA NETWORK (not wifi) being able to connect, SO if you go to DATA USAGE under settings and UNCHECK "MOBILE DATA'' the error will no longer be received, the problem is if MOBILE DATA is disabled, then you basically cannot use your phone. My phone is not currently topped up, and I recieved the error once again, thus I cannot conclusively say my answer above is actually working as opposed to turning off the ability for DATA apps to connect. It's more like hiding the error, my fault, I thought I had it fixed. May have to turn this one in to Virgin Mobile afterall. I'll give an update once I get my phone topped up.
Edit: Actually if DATA NETWORK mode is disabled you still will be able to make/recieve phone calls and text, but you will have to be connected to Wifi to be able to access the web, use mapquest, search google play etc. Still looking for a solution.
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