I have bought an optus sim card and every incoming phonecall is shown as withheld. also when i call people it shows up as wittheld. when i send a text message it shows my number though

HI smokinsi i'm not sure which rim you have. But it souds like you have to reboot the phone by taking the battery out and putting it back in. Also you may need to use the desk top manager so that the phone is configure properly. I not sure what your looking to do Al rim phones with the exception of a few are global ready. Also not every dim card is going to work with rim products. You can go on the carrier'site and activate the sim card. The sim card sounds like it idn't configure for the phone.

I’m happy to help further over the phone at https://www.6ya.com/expert/ronald_e152e07e272e4f27