cannot make a conference call

[jamesbedz]

i have a problem here on making a conference call on my sony xperia j..when i press the join calls button a message is popping out saying "cannot make a conference call" or something like that..can anybody please help me with this problem.by the way i have tried it using my xperia U and it is working well.

[Rickard]

Conference call is an operator service and your operator/subscription must support this in order for it to work. Did you try the same SIM in these phones?