buy a prepaid sim on ebay. although your phone IMEI number will still be tied to you. your best bet would probably be to buy both an unlocked phone and a prepaid sim or just go to your local electronics retailer and buy a tracfone. they dont require any personal information and its relatively cheap.

Tracfones are dirt cheap. You can register on the web. You can buy minutes when you want them. Most importantly, only you see your calllist. Coverage is as good as that of expensive carriers.

That's usually stored on the phone ad not the card. You can, however, delete the history (texts, numbers called and received, etc).

You'll actually save money and get less headaches. You can pick up the cheapest tracfone for between $10 (I've seen the cheap 'stick' ones on sale at Walgreens) and $20.00. Others are right with dirt cheap. Don't go through the hassle of swapping sim cards, etc. I don't think it's worth it.

For the infrequent hobbyist

Go to Walmart and buy a tracfone for $8-10. They come preloaded with about 20 minutes of airtime...more than enough to book and confirm an appointment.

Get a Google Voice account linked to your hobby email account.

Link the prepaid phone to your Google Voice account. Then you can go through multiple tracfones in line with the pace of your hobbying schedule while maintaining the phone number for verification purposes.