Remote access using Cellular Network

It's a bit unclear - which end of the connection doesn't have an internet connection?

Assuming the PLC is already connected to the internet, do you have RSLinx & RSLogix 5000 running on a computer at the remote site? Neither application will run on an iPhone.

If you do have a remote PC, you might find a remote desktop app for the iPhone.

If the PLC lacks an internet connection, it's easy to connect using a GSM modem. Might be expensive, though!

My Office computer has RSLogix5000 with RS Linx Pro installed and has a internet connection. I have to connect to a PLC out in the field(Oil Well) and is there is nothing around for 30 KMS. The only way you can get conected to the internet is a celluar phone(One of the workers on site has a cell phone). If i could somehow connect this PLC to the internet I can set up a VPN connection.

Call prosoft http://www.prosoft-technology.com/ they have what you need and ir is designed to work with rockwell processors. Not much documentation on the cell stuff on the website but call and they can email you some info. They have equipment for all major cell carriers.

ScadaMobile from http://www.sweetwilliamsl.com. There is a lot of info on their web site.