To do that I would need to use my new fon. I still can't see how I could do all that monitoring as I would still incur same problems. Not knowing if my sms has been received or not or been received and not replied to or replied to but not received.
This information could be detectable by using another method of contact between you contact/contact through other means for example social media or calling. As mentioned before this is crucial information we would need as a base in order to carry out an investigation.