Hi Peter, I just use the motorola to listen to my providers arcfn. Then i watch for traffic from my regular non-osmocom cell phone operating in the same cell. Are you talking about a hardware modification of the motorola phone to receive also uplink or just some software 'tuning'? I'm the transmitter in my case. Thank you Stefan ----- Ursprüngliche Nachricht ----- Von: Peter Stuge <peter(a)stuge.se> Gesendet: Freitag, 13. Januar 2012 14:47 An: baseband-devel(a)lists.osmocom.org Betreff: Re: 3GPP - paging references Stefan Bauer wrote: You already know what you send. If you want to listen to what someone else sends you indeed need a receiver. The Motorola phone can be modified to receive also uplink, but if the transmitter is far away it might not work anyway. //Peter