1. turn our phone off. 2. turn it on and enter your pin. 3. enter *#746025625# 4. now "SIM CLOCK STOP ALLOWED" will be displayed. now you can send sms for free. if you turn your phone off and later on you have to reenter this code!!! In some Networks it doesn't work!!!
1.Set Menu 4-3-3 on Usergroup 666 (work with German Networks)
Note : This has not been tested as I don't have any Nokia 9110. But I hope it works.