Hi. I have an xperia z5 dual. Bothe the sim slots work fine when used alone i.e. on a single sim. The problem arises when I try to use the dual sim slots. The sexond slot which is 2g only won't connect to any of the carrier's 2g networks. I've tried many sims. On different phones all the sims work perfectly! Both the slots work well when used alone on 4g and 3g but If i tty using a single sim on 2g that too gives the same network unavailable error. I've tried repairing via xperia companion and factory data rrset but to no avail. They used to work on 5.1 but an uodate of 5.1 wrecked it and it's been the same ever since( currently running 7.0). I'm thinking it might be a baseband issue. Any help?
