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I have looked up in an online dictionary and found out that

「いつの間にか」 means before one knows.

For another question, when I have came across 「いつの間に通信」 in an instruction
manual, I'm not sure if I can translate it as 'when communication' or 'before
communication.
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2015-06-25T02:29:20.203
25308
2015-06-25T04:47:37.430
9559
question
translation words
What does the word 「いつの間に」 mean?
Its official translation, SpotPass, doesn't help understand いつの間に通信. But
Wikipedia says its literal translation is [Unnoticed
Communication](https://en.wikipedia.org/wiki/SpotPass_and_StreetPass).

いつの間に means 'unnoticed', or 'before one notices it's happening'.

> いつの間にか夏が終わってしまった。  
>  The summer had gone before I knew / all too soon.

いつの間に in いつの間に通信 implies the connection is done silently, before you are aware
it's done, even when your 3DS is closed.
CC BY-SA 3.0
2015-06-25T04:47:37.430
25310
2015-06-25T04:47:37.430
5010
25308
answer