Dual Sim selector

Hi,

I have bought my first iphone and I configured it to use it as a dual sim.

I have more than 1000 contacts and it's absolutely crazy to define a default number to use to make calls, because amoung my contacts I would say that 50% are personal and 50% are for work.

As I cannot check all the contacts and define which number use for each of them, I am asking if there is an app available in the app store that works as a "sim selector".

Everytime I make a call, I would like to have to green buttons (one for sim 1 and one for sim 2) and decide everytime which sim I should use).

I know that iphone allows to change this settings in the menu, but it's crazy to go to check there everytime.

Thank you.