Which network to port to without topping up?

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6 Apr 2015
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203
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UK
My parents are on Plusnet Mobile (£9 monthly plan) and seen the same plan for £6 for new customers, they rang Plusnet to see if they can change to that offer but they couldn't do it and was told to request a PAC code (which my parents did), port to a different network and join back Plusnet to get the deal but which network should they port to without the need to top up to activate the sim as O2/Giffgaff requires you to top up £10?
 
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