There should be a serial RS232 port or USB cable available for your cellphone that will make it recognise as a network device, and you use that to define it as a dialup account. I've seen a few of these and the speeds were atrocious, around 14.4k to 19.2k bits like old fossil modems. (All these were on RS232 serial ports, a USB version may work better.) Use the AC adaptor (laptop and phone) when connecting by cell phone, the range and speed may be a little better.