There are several reasons for error message “Not registered on network” when you try to make any call on your Android phone like Samsung Galaxy series (including Galaxy Tab) etc.

I recently faced similar problem on my Samsung Galaxy Tab with a new SIM. For me solution was to disable 3G on my phone.
If you are getting similar error message when you try to make any call (audio / video), following may solve your problem:
If nothing works, you can reset your phone to factory default or take your phone to service center.
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NONE of these solutions are working for me. I reset factory settings, I took it to a repair place TWICE, took it to my service provider TWICE, and oddly enough, the last time I took it to my service provider it was magically working JUST FINE. Then as soon as I got about 20 blocks away it just quit on me. Will not make or receive calls (“not registered on network”), will not connect to my service provider when I do a search (“your SIM card does not allow a connection to this network”) It’s been doing this since I got it unlocked. (Samsung Galaxy S 4G) I would think that it’s something to do with unlocking but I’ve tried someone else’s SIM card (Rogers, I’m currently trying to use MTS) and I could make calls just fine (couldn’t try the data usage because theirs wasn’t set up with a data plan) Help?
ummm just had this happen to me… has anyone thought to check and see if the sim card was installed in the correct direction?