Translator app for iOS

[ooame]

hej

i'll travel japan from may to june and i'm just starting to prepare. i'd like to find a translator app for when it's not possible to communicate using hands, english or a simple dictionary. i need a program for iphone 4. it should be useable offline and deliver good translations of whole sentences. best would be, if there'd be a direct voice translation.

anyone here who's good experience with such an app?

if there's no such thing for offline-use i have to think about getting a japanese SIM with mobile internet. i read some good stuff about 'itranslate-voice' and 'istone travel translation'. anyone of you ever used them?

also i would like to have a visual translator for street signs. i thought about 'waygo' or 'word lens'. is anyone using one of them and could give me some advice?

thank you very much in advance

ooame