From memory a lot of ZTE and Huawaei phones do tend to be dual sim. I think there's a few triple sim ones as well.
Seems to be a super popular feature on asian markets for some reason. Exactly why, not sure.
Perfect for scammers! haha, but seriously, having 2 sims is beneficial as you can use one phone for both work and personal numbers. Much better than having 2 phones.