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Yes you can. You will be able to pick up where you left off when you come back. But to secure your account for when you come back, get an authenticator and apply it to your account. Hackers love inactive accounts.
I bought a physical authenticator, as I have heard of issues happening with the phone ones in Canada.
It's entirely up to you, but I was able to pack up my authenticator in my collector's edition when I took a break, and it was there waiting for me when I returned :)
Not sure how the phone one works, I believe there are FAQs available?
Edited by Proxied on 12/12/2012 12:08 AM PST
SMS protection is not the same as an authenticator.
If you have a smart phone the mobile autenticator PLUS SMS protection is fine.
Just one word of caution if you get the mobile authenticator immediately locate the serial number, write it down and put it in a safe place. You'll need that number to easily remove it from your account should you ever loos/break/reset your phone.
SMS Protect is a text messaging service that lets you know about account changes, NOT an Authenticator.
The only two valid authenticator options are the one for smart/mobile devices and the keychain. FAQ is here https://us.battle.net/support/en/article/battle-net-authenticator-faq
As Arizza said, if you get the mobile one write down not only the serial number, but also the restore code! That way if you break your phone you can put the application on a new device and have access to your account again.
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