Just upgraded with Vodafone on a £31 a month deal with Galaxy S3 and was told that they have a deal with lots of employers and if you work for one of them then you get 20% off your monthly line rental so my £31 tariff became £24.80.
You can get 10% off your tariff if your price plan is less than £20 a month.
Unfortunately there's no list of participating employers. I work for the NHS so i know that they're one of them.
If you're due for an upgrade then it might be worth a quick call to them or perhaps drop a message on their forums to check if your company is included.
Hope this helps someone.
only valid via Vodafone online or instore, not valid via other sites for a Vodafone contract.
- Red Devil PJB