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You just need to encode the settings of your service provider once.as long you are using it with out any problem in software,you can use any sim you want.but if the phone have been corrupted and need to format or reset.the previous settings that you've made will be erase and again you need to set another network provider settings to activate using gmail log in.
Based on the following bolded statement from http://www.htc.com/ca/faqs.aspx?p_id=269&cat=78&id=99764 , I'm not sure you can do that with stock software...
How do I copy Contacts from my SIM to my phone? To copy contact entries between the device memory and the SIM card, follow these steps: Note: Only copying from the SIM card to the device is supported.
From the Home screen, tap the Contacts icon.
Press Menu and select Import Contacts.
Perform one of the following:
Move one at a time: Press and hold on and select Import from the pop up Menu.
Press the Menu key.
Tap Import all. If you want to get the contacts off your phone, what I suggest is to synch your contacts with your Gmail account, and export from there to a .csv or .ical file.
Another way to do it is to go to the marketplace
and download the "contact exporter" app, then export contacts as a .csv file. then
you can log into Gmail and import all those contacts from the same .csv
file. this will automatically sync over the air with your another Android phone. Very easy.