Depends on the resources available. Today it could be done by using the internet.
In the 1990s call forwarding could trick things a little.
Cell A places a call to cell b which is inside a box shipped to a post office in the USA. The ringer has been disabled so no sound is heard.
Cell B has call forwarding setup to Cell C which is inside a box shipped to a post office in the USA. It call forwards to yet another Cell phone in the same circumstances.
A couple of cell phones later the call is sent to a Cell phone inside a post office somewhere in Europe. it forwards to the final number.
So you place your call to Cell A it is bumped to cell b then to cell c then to cell d and so on till the last cell forwards the call to the number you want to reach.
Should take a minute or so to locate each link giving you a few minutes to play with.
Even more fun. With T-mobile voice mail I can record a message on my cell's voicemail for delayed delivery to another tmobile cell. so use the prepaid cell to setup the message, crush and dispose of the cell and ship the remains out of state.
