How to set up the Internet on a megaphone login tablet with a megaphone 4G SIM card?

Question

Android

The question is in the title, the tablet itself does not support 4G, where the signal indication says "no internet connection", I tried to set it in the settings "Only 2G" did not help. Internet tariff connected. Another question is how to restrict access to a child so that paid applications are not bought?

Answer 1

On the second point:
1. Do not tie art to Google's account.
2. If you have already tied it, in no case do not check the box "do not ask for a password again".