Xperia S not connecting to 2G network

[nileshgarghate]

Hi,
I have Xperia updated with version 4.1.2
My device is not able to connect to 2G network at all.
Whenever I m in 3G network then only it connects to network but I migrate to 2G network, it is not able to register itself on 2G. I tried inserting other network SIM in it, even that is not working. I went to Sony Center, even they could not resolve the issue. Xperia support center is saying there is an issue going on & they will be releasing new update soon.

[Uliwooly]

@ArifKhan

That's not a phone issue, it's a network issue, 2G it's not supported in a lot countries anymore, you might want to contact them regarding that. As for 4G, are you referring to 4G LTE or the faux 4G (H+)?

If the former, is your SIM card 4G compatible? Do you have the correct APN settings? is your phone compatible with your carrier's  4G LTE bands ?

if the later, do you have the correct APN settings?