Please fellow naira landers, can you help me out?
There's a particular MN phone number I call a lot from my Glo line but there have been issues with the calls. When I began suggesting to the owner of that line during phone calls that perhaps her phone had been tampered with, some of the issues stopped.

(1) Whenever we called each other there would be no dialing tone until 2 weeks ago when the actual person being called and I began deliberately saying during calls that some persons were spying on our conversations.
(2) Whenever we called each other someone else - a man at times or a woman - would answer before the call timer starts counting. Once I accused the male stranger who then cut the call before the timer began. At times one of the two strangers would answer & then immediately the timer starts the actual person being called would answer.
(3) Many times till date when I dial that number the call would drop immediately like an automatic cut.

The owner's privacy is not respected by co-residents who have been unlocking the phone. Is there any possibility of that malicious programmes have been installed on the phone? If yes, do you have any suggestions on how to identify & remove such. I would like to have evidence obtained and the culprits identified and punished.