Any software to block all calls and all SMSes allowing only 3G internet? My dad gave his other dual-sim card to me, which has internet service that he does not need. I do not want to get his calls or SMSes, I only want to use his internet.

I have tried to do this unsuccessfully with Mobile Manager. I selected the option to block all calls and SMSes with the software, but I can see missed call notifications. I do not want to see them at the top bar. The internet connection works nevertheless.

Is there any way to solve this problem?
Wouldn't it be easier to just change the contract on the SIM card to a data-only contract and let the phone company do all the blocking for you? It would also save you paying for services you're not using.