Usage will not incur any transmission fee since the translation process does not require network connection.
ENGADGET: NTT DoCoMo preps automatic translation from Japanese through Android, leaves no one an island
After taking the picture of the sign, it will appear on the camera's display with the translation, having looked it up on the internet through a wireless connection.
BBC: Digital cam translates in a snap
The idea is that by using a wireless connection to the internet, the device can be a handy camera which makes use of translation resources on the net.
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