Is it possible that I could call a mobile number, but have the call forwarded through another number active on a different phone that someone else has? I have had unlimited access to the other person's phone prior to this.
Is there any way of that happening without the person with the other phone realising the call is being forwarded through them, or the phone records for their phone showing that the call had been forwarded from me?
EDIT: Sorry, just to make it more clear, it's not just a case of spoofing the other person's number, it must also look to the network provider like the call has originated from the other person's phone, not just the call recipient. So when the network provider looks at their records it will show the other person's phone has made the call while connected to mobile mast wherever they are. I would assume it would take some kind of invisible call forwarding (as suggested in comments, going to look into that) or malware loaded onto the phone.
I'm wondering about whether it is possible/practical, and if it is then how feasible the attack is and the skill level needed to carry it out. The location is the UK and other person's phone is a relatively old (2009 or before) Nokia Pay-As-You-Go type phone if that makes a difference.
I was given the following situation recently by a friend that works with people who claim they've been wrongly imprisoned. This happened in 2009.
A guy gives me a pay-as-you-go mobile phone so that he can contact me when he needs to. Unknown to me, the phone is cloned. He makes lots of phone calls on his own phone, but the numbers he calls (in another country) show up as being made by the mobile he gave me. The cell site analysis shows the calls were made via a mast that was close to my home, or a mast close to my workplace.
Does that mean he would always have had to be fairly close to the mast near my home or workplace when making those calls?
Or could he have some way of tampering with the phones so that he could be making calls while 50 miles from me, yet those calls show up as being made on the mobile he gave me, AND cell site analysis shows the calls went via the cell sites near my home or workplace?
Now I'm fairly sure from research I've done so far that even cloning a modern SIM card is difficult. But say they did manage to clone it, even then I've seen it suggested having two phones on the network at once would trigger alarms for the network provider. And even then there's the problem that the phone calls are being detected by the network provider as coming from the cell mast near the 'innocent' guy's location.
For these reasons I'm pretty much discounting the SIM cloning, however call forwarding as described below I'm not so sure about.
One other point is this. I call a number, but the call is forwarded to another number. Is there any way of that happening without me realising the call is being forwarded, or the phone records showing that the call had been forwarded?
This is the part my question is about. It doesn't sound possible to me even with the ability to have pre-loaded some malware onto the other persons phone but I'm not an expert.