Saw this on facebook. Vaya 4G Plans - 20% Discount for New Customers. Like this previous deal https://www.ozbargain.com.au/node/99285
T&C's: Valid only for applications from new customers received from the 1st of May 2013 onwards. Not available to existing customers with a service already connected prior to the 1st of May 2013. The 20% off is valid on your plan access fee only and will be applied as a monthly discount off your plans access fee for a maximum of the next 24 monthly invoices, the promotional discount is valid for both month to month and 24 month contract options.
I looked into them as my contract end-date with Vodafone is approaching (counting down the days). After reading some reviews on Vaya I decided it might not be a good idea. Particularly their customer service does not seem to receive praise.