@BambiIf you change tariff mid contract then yes, subject to the terms of the extra as some dont allow you to keep them if you downgrade tariff.
If upgrading, then you have to start again
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iPhone 16 Pro Max - o2 and Spusu
Xperia 1V - Spusu
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This is not customer services and we dont have access to your account
I do not work for o2 or any VMo2 /Telefonica/Liberty Global Company