Here are example instructions for how to enable network sharing on some Samsung Galaxy phones
Most modern mobile phones can serve as a wireless mobile access point. Check your phones manual and settings for "mobile network sharing", "portable Wi-Fi/WLAN hotspot" or similar. Once you enabled the data sharing, you can simply connect your Tobii device as you do with any WLAN network. It is still possible to send/receive text messages via Tobii Communicator (I-Series: connected via Bluetooth, C-Series: using the build in GSM module).
Connecting your Tobii device wireless to a mobile phone:
If you have an internet-capable mobile phone, you can connect your Tobii device to surf the internet or send emails by using the phones data connection. This can either be done via a wireless network connection or by connecting the phone via USB.
Connecting your Tobii device via USB cable to a mobile phone:
An alternative option is the so called USB tethering which is also supported by most modern phones. Refer to your phones user manual for "USB tethering" or "use as a wireless modem". The advantage here is that most mobile phones will be powered through USB from your I-Series and don't drain the phones battery.
Please note: Make sure to have a data plan with your mobile phone carrier as this could mean high extra costs depending on your mobile phone subscription.