Hello!
I would like to help you with OpenVPN configuration. I suggest you to buy VPS in [login to view URL] (very good VPS and server provider) and use it as main OpenVPN server, another locations will connect to it as OpenVPN clients. Of course you will be able to connect from your mobile devices.
I have big experience with OpenVPN servers\clients. Experience with variety of different configurations OpenVPN servers, such as serial connection 2 or 3 OpenVPN servers, for maximum security. OpenVPN over IPv6 protocol. I have big experience with network administration and pfSense. Experience with VMWare ESXi, MS Hyper-V, Proxmox VE, Mikrotik and some different skills.
My another skills and reviews you can see in my profile.
Hope for cooperation!
Thank you!