other than if a cheaper sim is available for backup / additional usage, but soon as the contract ends can make sense to unlock it anyway assuming it really was locked in the first place.
Might've changed now but at one time there was no such thing as a locked LG.
4Gs can be unlocked too.
In the US where there may be unlocking issues probably easiest to go into ebay.co.uk , have the code messaged or emailed and pay by Paypal. Almost seamless invisibility 
Got a friend coming over from OH in a few weeks time to visit her new granddaughter. She's going to leave here phone at home and pick up a used unlocked phone here and a pay as you go sim to go with it. My sister does the same when she's here from Oz but already has a phone for such use here.
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