Optus is rolling out their 4G network in Sydney and Perth today, claims tech-site Ausdroid.

Citing an unnamed source, Ausdroid claims a 4G USB modem and 4G WiFi hotspot device will manage internet connections on Optus’ new 4G network, in addition to their existing 3G/3G+ networks.
 
During Optus’ internal testing, wireless data speeds maxed out at an impressive 200Mbps. Optus’ acquisition of Vivid wireless would’ve helped the company reach the speeds as it granted access to wireless spectrum previously unavailable to them.

Ausdroid also allege 4G smartphones from HTC and Samsung will be “deliverable to customers very soon.” Currently Telstra offer the HTC One XL and the Samsung Galaxy SII 4G, but we’re hopeful a 4G variant of Samsung’s Galaxy S3 could make its debut.

More to follow.

Update: Optus has confirmed to press it has already upgraded 1000 mobile base stations in Sydney, Melbourne, Darwin and Perth which will carry 30 percent more data and penetrate buildings better complements of a stronger signal. Despite the availability of 4G in Sydney, Newcastle and Perth, it wont be switched on nationally until 2013.