If you have a pre-paid TELE2 SIM card, it will be deactive as of 1.April 2010. You can trade it in for a free Sunrise starter kit either on-line (they should be mailing you a promo code to enter to get it free) otherwise stop in any Sunrise shop or call the 0800 hotline:

www.sunrise.ch/tele2

...post-paid contracts don't seem to be affected...

In in 6 months it will convert to orange