In short, you don't. Or at least you shouldn't.
It is not recommended that updaters be run from mobile devices for the very reason that they are mobile. One of the biggest reasons for this is that a mobile device that updates the address for your network when it is away from home means that your home will no longer be protected by OpenDNS because it's address has been changed. Also, generally speaking, if you do update the address while away like this you are also claiming someone else's IP address as your own (it could be a neighborhood coffee house, public hotspot, or even your employers network), when in fact it is their network, and they have the right to determine how it is managed, not you.
