LTE (4G) problem

[zoran81]

Hi there,

After upgrading to Lollipop I experienced some problems with 4G.
When I'm switching from WiFi network to my carriers data network, and when the phone is set to prefer 4G the phone it often can't find data network, but when the phone is set to prefer 3G it find network as soon as it lose WiFi and if I than change to prefer 4G it imediatelly change from 3G to 4G.

I'm on Croatians T-Mobile network.
Sorry for my bad english.

[zoran81]

No..often is too hard to connect to 3G or H+ if the phone is set to preffer 4G data transfer..but when is set to prefer 3G it connects very fast.

Now when I notice that it's not connected to data I switch off the 4G, the phone finds 3G, and then I switch 4G on and phone stays at 3G..but this is not a long term solution.

[Uliwooly]

@zoran81

Ok, that's a network coverage issue.

[zoran81]

Ok, so eveything is ok with my device and the problem is with T-mobile?

That's great!

Hm, and T-mobile adverise it self as a network with full 4G coverage of the country..and fastest 4G too..hmm..

[Uliwooly]

You can check online, look for their network coverage map 

@zoran81

[zoran81]

there is a full 4G coverage in my area

[Uliwooly]

@zoran81

And your phone it's compatible with your carrier/network's LTE bands?

[zoran81]

Yes

[Uliwooly]

@zoran81

Are you 100% certain that you have the correct APN settings?

[zoran81]

yes, APN settings are preset with new SIM, and also I asked T-mobile CS for APN settings

[Uliwooly]

@zoran81

It seems that you have to contact your local Xperia care 

http://support.sonymobile.com/global-en/contactUs/