Dual Sim Mobile Phone

[netibiza]

Am getting a new dual sim android phone at the weekend, now tell me, when I put in my usual Spanish payg sim (yoigo) and my English payg (Orange) sim, will all the data, ie whatsapp, FB, contacts etc still be on the Spanish card so I do not have to add names and apps. First of all the Spanish sim will be the main one, then when I get to England the Orange sim will be the main one, so will my spanish whatsapp, still be working? Do you see what I mean? Thanks.