I received unsolicited messages and OTPs for multiple days. Found my phone is acting strangely. Menu with phone, speaker and other device name appeared on pressing speaker button after messages were opened. Went away after restarting phone. So I believe (but cannot conclude) that the i phone is hacked or compromised (may be by a series of binary messages). So I came across Certo Antispy while searching. My question is whether it is safe to use it? According to Certo the app is not allowed on the AppStore but can be run using a PC or Mac. Thanks.