Three/Smarty have twice the capacity on band 28 as they do on band 20 (10MHz as opposed to 5MHz), so their band 28 is generally going to give better performance (in terms of data speeds) than their band 20, and my own experience backs that up.My gues...
I'm in possession of a spare ('Bonus') Smarty SIM, and mine does not say to activate it through the app - it tells you to go to smarty.co.uk/activate.The activate page asks you to log in if you already have an account. As a new user, it is not expect...
My guess would be that your phone is not fully compatible with Smarty's VoLTE.. see this page for more info. Your phone is not listed on Smarty's list of incompatible devices, but there are hundreds if not thousands of companies making Android phones...
The money gets taken from your account on the day your plan resets. Smarty is a pre-pay service.. it's not like a pay monthly contract where a bill is produced then the money gets taken some days later. Each time your plan resets you are paying in ad...