Can I install it using one SIM, but then give the phone to someone who uses another SIM? / Can I change SIM cards? Support Team October 29, 2017 01:53 Yes, off course. It will not effect TheTruthSpy app operation. Related articles How to activate TheTruthSpy features without touching the target phone? What is monitor number? I should insert a monitor number in which format? ---> read this first <--- If there is a passcode on the device can you help me to bypass it? Comments 0 comments Article is closed for comments.