I bought a Teca T-806 tablet (running Android 5.1) for my partner. It supposedly has 4GB RAM & 32GB "phone" storage. Currently only a 32GB SD card is installed though up to 128GB is supported. It generally runs quickly and has a quite good screen. We have added only a modest number of apps so far. During attempted app updates an error shows "Insufficient storage". Clearing cache very occasionally works. My own Ellephone P6000, with only 2GB RAM & more apps, has NEVER displayed this error so at first I assumed it was pilot error (her first Android device)! However it does not appear to be . . . . When I looked at the problem I noticed a very odd fact - the graphic display of available internal memory did not correspond with the figures displayed - by a massive margin. See the attached image which shows: Internal Storage - Total space: 3.87GB - Apps: 1.16GB - Cached data: 98.85MB Simple arithmetic suggests over 2.6GB should be free. The graphic bar appears to correspond with this - BUT the figures state only 418MB is actually available. Reboot causes no significant change. Uninstalling some apps not possible to move to either phone storage or SD card along with clearing many apps data (I was becoming desperate) finally allowed BBC Radio app to update but unfortunately broke several other functions! Can anyone explain where the other 2.5+GB has gone and if it is possible to make it truly available? Is this an Android bug (I remember reading Android 5 had memory issues), or is there perhaps some hardware error? Many thanks in anticipation.