Does your phone support Esim? O2 has Esim so this is what I would do, I would put O2 as my Esim. When you go to UAE get a local sim card to use there. I had Estalaet. You can use it in KSA as well in any Middle East country. I never had a problem with Data using Estalaet. If you are in Europe use your O2 sim. Hope this helps