My project requires a 2G/3G/4G device with SIM card be installed in a remote location (Russia) so I can access it from Canada and make phone calls and use VPN over that SIM card. Right now i have Internet cable in the remote location with DD-WRT router for VPN and GSM gate with SIM card for making phone calls over VoIP. The system seems too over complicated because I pay for cable Internet and for a plan on SIM card which also includes Internet and I use a separate device for VPN.
Can you please advice a 3G/4G modem with OpenWRT which would do all in one - Internet access over SIM card, VoIP phone calls over the same card and VPN server in the same device so I could connect my IP camera to it and watch the remote site over the VPN as well?
Thank you in advance