PPTP protocol 3

• Anonine: PPTP Installation Guide for Android Versions 2/3
• Anonine: PPTP Installation Guide for Android Version 4
• Anonine: PPTP Installation Guide for Android 5

L2TP protocol 1

• Anonine: L2TP Installation Guide for Android

OpenVPN protocol 2

• Anonine: OpenVPN Installation for Android
• Anonine: OpenVPN for Android Installation Guide

IPsec protocol 2

• Anonine: IPsec IKEv1 Installation Guide for Android 6
• Anonine: IPsec IKEv2 Installation Guide for Android 6

Stunnel+OpenVPN protocol 1

• Anonine: Stunnel + OpenVPN - Android Manual Configurations

WireGuard protocol 1

• Anonine: WireGuard Installation for Android