I changed the SIM card in my phone, forgetting that I had anti-theft installed and now my phone is locked. I am not able to reset it to work again. I have used the command UNLOCK by SMS fcrom another phone, but it does not work. I also used the online facilities, setting a new Avast PIN. When I restart my phone it asks for the security protections password to unlock.
I don't understand your description of how-to unlock a phone. You say you removed Avast first. Do you mean the app and which one of them? How can you perform it and also remove the admin properties for anti-theft when the phone is locked? Also, Does it matter which SIM card (the old one or another/new) that is put in the mobile for using your solution?
I would appreciate any help in this issue, since I don't want to do a factory reset by many reasons. I cannot cope with being out of my phone any longer....