I have purchased a second Android smartphone because the internal memory on my first smartphone was full and I needed to use more space for apps, pictures, and videos. But the second smartphone has no installed sim card (I currently have no need for two sim cards to be used within the same country).
So my question is, provided both phones are on at the same time, and provided no Wi-Fi is available because I happen to be on the road and not at home, what is the best way to have the simless phone utilize the other phone's network operator data network? What network protocol should I use for this and what are the steps involved?
Assume the phone with the sin card is an Android KitKat 4.4.2 and the other a Lollipop 5.1. Thanks.