i think the key is "test sim is from another country and doesnt work here". with a working SIM, i think push will want to go through EDGE, which normal people without data plan will get charged quite a lot.

so if we can find a way to get Push working through wi-fi only (eg, like ipod touch) by somehow make push notification part think there is no valid SIM, it is worth going through the activation process to get push working.
otherwise i don't think it's really worth spending another half a day to try this out and all the effort to get the phone back to how you customised it.

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