With Verizon's LTE launch set for this Sunday, Clearwire's Chief Commercial Officer Mike Sievert takes to the company blog to take a few shots at Verizon and T-Mobile. Amusingly, Sievert claims that T-Mobile and Verizon's entry into the faster wireless broadband space has "prompted many in the industry to start a debate over the definition of "4G". Technically, what actually began that debate was the fact the ITU recently declared that none of the current deployments are technologically robust or fast enough to be considered true fourth generation -- though this doesn't stop Sievert from waxing poetic about what he thinks 4G is:That's all very interesting, except for the fact that WiMax isn't technically 4G, and neither is T-Mobile's HSPA+ or Verizon's current LTE incarnation. It's the ITU that declares what 4G is or isn't -- and not somebody's marketing department. It's not clear if Clearwire knows this and is just ignoring it, or if Sievert just hasn't kept up to date with industry discussion. Sievert then goes on to take aim at Verizon's 5GB and 10GB caps, which as we noted yesterday can be burned through rather quickly at the faster speeds LTE provides. Says Sievert:Of course given all of that Clearwire debt, the company may decide to eventually follow Verizon's lead and apply more punitive overage pricing models.