I had bought an iPhone and therefore had to reduce my sim card and I will soon buy a new phone and wanted to ask if then the miniaturized sim card ever fits into the new phone (wanted to get me a Huawei or Samsung)
Yes, but it could be that you need a kind of "adapter".
If it is too small then you get a Simadapter, which you can get in mobile phones and electronics stores
If you have nano sim and the new one is normal then… Then it fits