Do you need to "enable LTE" switch to use HSDPA+ and DC-HSDPA? (UK/Europe)

given won't compatible 4g or lte in uk, need enable lte switch fastest speeds available here? or wiser leave switch off save battery it's not needed anyway?

 

wirelessly posted (mozilla/5.0 (iphone; cpu iphone os 5_1 mac os x) applewebkit/534.46 (khtml, gecko) version/5.1 mobile/9b176 safari/7534.48.3)

couldn't see switch, network on?

 

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