On my Sony Ericsson Xperia mini pro, stock ICS, Google Talk remains signed in all the time. Is there a setting - within Google Talk, in Sync settings, or otherwise - which can prevent Google Talk from signing in? I just don't like being online on IM clients and I don't want to be signed in.
On all my android devices (3 HTC phones and an Asus Transformer), if you sign off gtalk manually (gtalk/menu/exit), gtalk does not reconnect again until you do it manually.
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1I can confirm this. On Gingerbread, ICS and Jelly Bean (and quite possibly on earlier OS versions) if you sign out of Google Talk manually, it stays signed off. – Chahk Aug 10 '12 at 18:56