No mobile data

[Tenbears10]

I have a Z3 on 3 network in the UK. I regularly have 4 signal bars on the phone but no mobile data. I search for networks and 2g 3g and 4g 3 network is available I choose one and it either takes a long time 'registering on the network' which is not always successful and tells me to try again later. Alternatively I get 'unable to connect to network try again later' and all the bars then disappear and I am left with a red cross above the greyed out signal bars. restarting the phone sometimes gives me signal and mobile data but should I have to be doing that several times a day? This occurs in many locations both indoors and outside. I have contacted 3 but they are amazingly unhelpful.

Thanks in advance

[Uliwooly]

How old is the SIM card? 

Also is it a MICRO NANO SIM card or did you trimmed it to make it fit?

Settings > about phone > status > signal strength> how bad is it?

[stockyvillage]

@uliwooly It will be a nano sim

[Uliwooly]

My bad, you are right I stand corrected

[stockyvillage]

If @teddybear requires APN settings for 3 UK let me know as that's network I am on.I am on HSPA indoors at moment signal strength -99dBm 7/asu and showing 3 bars.

[Tenbears10]

So in my house close to a big window it is showing 

-111dbm 29asu but it changes every 5 seconds? 

-97dbm 8asu

0dbm 99asu

-113dbm 27asu

etc etc is that normal?

The sim is a nano and it was sent from the network not cut down.

[Tenbears10]

sorry the sim was sent by 3 in sept 2014 to fit the brand new phone which I ordered direct from sony

[Uliwooly]

Signal strength fluctuates, that's normal, but your network coverage it's not ideal (poor network coverage) 

[stockyvillage]

@uliwooly most networks like that in UK.When he is going to 111 and above he is changing from hspa to hspa+.Mine does the same on Z3 ,Nexus5 and Z3 compact all get same signal strength

[Uliwooly]

I see