Default SIM card for mobile data connections in dual SIM phone

[Android Central Question]

Hello,

I have Xiaomi A2 with two SIM cards, one from a company in my homecountry (Spain) and another one from a company in United States, where I currently live.

I see there is an option to select the preffered card for messages, calls and data connection. My concern is how reliable is that. When I am in spain, I would set the spanish sim card as the preffered one, but when in USA I would set the one from there. It is very important for me that, for instance, if data connection is bad with the SIM card in USA the phone won't try to use data from the other sim card (the spanish one), as I would pay a lot of money if I use mobile data with a spanish card in USA, and viceversa.

So if I set my preferences in the use of one or the other SIM, is this choise reliable in all cases?

Many thanks in advance,

Joel

 

[Rukbat]

As long as the phone is working properly, yes.