If you turn 3g off what are the disadvantages?

wirelessly posted (mozilla/5.0 (iphone; cpu iphone os 5_0_1 mac os x) applewebkit/534.46 (khtml, gecko) version/5.1 mobile/9a405 safari/7534.48.3)

heard if turn off 3g while not browsing on internet or on wifi @ home conserve bit more battery.

question disadvantages of doing that?

 

it take bit longer voice mails , mms come in.

 

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