Vaya have launched their 4g plans (after LC did theirs yesterday)
the plans are as follows.
$9 - $50 talk and text - 100mb data
$16 - $200 talk and text - 500mb data
$22 - 650 talk, unlimited text - 1.5gb data
$34 - 850 talk, unlimited text - 2gb of data
$45 - unlimited talk and text - 3gb data
These are on the Optus 4G Network. Remember to check https://www.optus.com.au/4gcoverage for full details of where coverage exists.
Also remember that 4G doesn't affect call quality or reception - it only relates to data.
it looks like they will charge you $33 to upgrade.
alternatively you can port your number to a $2 voda sim, then port back ($20) for $22.
its stupid that existing customers are getting screwed to upgrade