Asus zenfone 9 roaming problème

[Zenmk]

 My phone is Zenfone 9. I can never use my internet package abroad. My operator is BASE. I have never had this problem before on my xioamai and Samsung phones. The Asus phone gets worse after every update. I'm about to break my phone. If there is a solution, can you please share it, thank you in advance. Never again Asus..!