... ,change your SIM singal to fixed telephone.3.Caller ID display ,can preset IP,preset calling time (when the time is ... change to another SIM card ).4.IMEI changing ,phone LCD will display the IMEI number and subscriber can set the IMEI number ... ;9) SIM card supported (1.8V, 3V);8) Caller ID display;9) DTMF Dialing;10) Bell signal;11) Polarity reversal;12 ...