World-of-warcraft – What happens if I add the starter edition to the Battle.net account once I already have a frozen WoW account

I have a terrible habit of not checking my mail before freezing my account, and I can confirm the clock stops for no man: after 30 days, the mail is returned, and after 30 more days, it's deleted.

Besides the clock, the mailbox works as if you were still subscribed. Your characters, for all intents and purposes, are considered merely "logged off" until you explicitly delete them, so mail will still be delivered even while your account is frozen.

No

Once you account status goes to "Frozen" (expired) you can't go pass the main menu so it doesn't matter if you are under lvl 20 when you cant select that particular character.

What you can do is have 2 WoW accounts (not Battle.net accounts), one is "frozen" and the other is "starter", you will need to create new characters but its purpose is to check updates and chat with people. When you subscribe (unfreeze your main account) the other one will remain "starter".

Now what I don't know is how to add more wow accounts... I have 7 of them name WOW1, WOW2... The problem is I was adding them when it was 10day trial and you had button in Battle.net account "add 10d trial" any you could click it anytime. Try to find something like that.

You could also register another WoW account with different username and pass and then merge use the merge option on your main account.