I have an LG Aristo through Metro PCS which is currently running Android 7.0. There are much more updated versions of 7.0 out there even before the jump to 8.x. Only i've tried to update it several times every which way from Sunday but it's still only running 7.0. So two questions...A: in theory, can this phone even *be* updated higher than 7.0? And B: Is it typical for wireless companies to just not allow their phones to be updated higher than X.X in order to make you buy a phone with the next version of the OS already installed? Thanks.