I am working over in Australia for a couple of months and got the iPhone 4 on release in the UK on the 24 of June, the only micro sim available in Oz is for the iPad, so bought one with a view of using it for data purposes onlt on the Testra 3G network .... no joy, just keeps coming up with Invalid SIm, but previously was getting a signal, be it slight .... believe it has something to do with the network settings and configuration ..... can anyone help, achieved what I'm after or know for a fact its a lost cause???
Not sure if this will work, but the guys over at Hijinks have some crafty solutions for using an iPad SIM. This article is titled "Activating an iPad 3G Micro SIM Without an iPad":
http://hijinksinc.com/2010/07/08/activating-an-ipad-3g-micro-sim-without-an-ipad/
And then there's the original article titled "Using a Micro SIM in an iPhone 3G" [and 3GS]:
http://hijinksinc.com/2010/05/14/using-a-micro-sim-in-an-iphone-3g/
Hope this helps.