On what do you base your knowledge.
Because there are reports that the cell phone WILL NOT ring unless a cell phone tower can pick up a connection.
Btw, taking the battery out is not enough of a test.
WOuldn’t you also have to take out the Sim card
Actually I do design work on these systems.
Yes of course the target cell phone won't ring but what you hear as ringing is not the target cell phone.
What powers the processor and the logic that connects to the sim card?
Here’s a quick answer for you... THE BATTERY!
I believe once you take the battery out, the whole system does not work in that device...The caller to that phone will have the call immediately routed to the voicemail, even if it is not setup by the account holder...If the phone is under power, it will ring to the appropriate amount of rings and then roll to voicemail...
Draw your conclusions...
Sure, the SIM card is a data/cell phone account piece of the system, but it still needs to have power to the reader that sees that SIM card...