Can I activate a dual sim functionality in Galaxy S7 edge sold by any UK's providers?

Hi guys,

Can I activate a dual sim functionality in Galaxy S7 edge sold by any UK's providers?
Three, O2 etc say I can't use S7 edge as a dual sim phone.
Is there any workout for this? I need a dual sim phone, but dont want to get S7 edge dual sim off ebay because my upgrade is in a few days......

Thanks

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