topic Re: Unable to connect to mobile network when roaming in XPERIA archive

Unable to connect to mobile network when roaming

mkp — Thu, 09 Jul 2015 14:26:03 GMT

Hello,

I have a z1 and currently live in Europe. My phone works well at home. When I travel to other European countries my phone automatically connects to mobile networks when roaming. When I go to the U.S., however, I am unable to connect to any mobile network. I contacted my carrier in Europe and they said I should automtically be able to connect to AT&T or T-Mobile. Roaming is enabled on my phone.

When I do a manual search for available netowrks they all appear to be blocked (there is a circle with a line through it next to all the networks that appear). My mobile carrier said there are no blocks on my account.

I am unable to set a new APN because it will not save. I already did a software repair using Bridge for Mac but the problem persists. Does anyone have any suggestions to fix this?

Thank you in advance for you help,

Mark

Re: Unable to connect to mobile network when roaming

Thommo — Thu, 09 Jul 2015 14:30:07 GMT

You maybe have a country or network band lock on your phone so yes your account may have no blocks but the phone may

Re: Unable to connect to mobile network when roaming

Uliwooly — Thu, 09 Jul 2015 14:30:22 GMT

@mkp

~~Is your phone network branded? perhaps that's the issue.~~ Thommo beat me to it.

another thing to try is to boot on safe mode and enter the APN manually, it might work

http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008

Re: Unable to connect to mobile network when roaming

mkp — Thu, 09 Jul 2015 14:34:45 GMT

Thank you for your reply. I bought the phone unlocked in the U.S. but it works well in Europe. Ironically it will not work in the country where I bought it. Is there a way to check if there are any blocks on it?

Re: Unable to connect to mobile network when roaming

mkp — Thu, 09 Jul 2015 14:35:46 GMT

Thank you. I will give that a try. Will get back to you and let you know if it works.

Re: Unable to connect to mobile network when roaming

Uliwooly — Thu, 09 Jul 2015 14:37:18 GMT

@mkp

That's quite odd, boot on safe mode and try to add AT&T's apn settings

Name: AT&T
APN: wap.cingular
Proxy: <Leave in Blank>
Port: <Leave in Blank>
Username: wap@cingulargprs.com
Password: cingular1
Server: <Leave in Blank>
MMSC: http://mmsc.cingular.com
MMS proxy: wireless.cingular.com
MMS port: 80
MCC: 310
MNC: 410
Authentication type: <Leave in Blank>
APN type: default,supl,mms
APN Protocol: Leave it on the Default one

Re: Unable to connect to mobile network when roaming

mkp — Thu, 09 Jul 2015 14:56:07 GMT

So I restarted my phone in safe mode but still have the same problem. I'm still unable to save a new APN and all the networks appear to be blocked. Is there any way to check if my phone is network branded or band locked? Like I said in an earlier post, I bought this thing unlocked in the U.S.

Re: Unable to connect to mobile network when roaming

Uliwooly — Thu, 09 Jul 2015 15:01:24 GMT

@mkp

usually the phone will have a network logo or network apps, is it the Z1 or Z1s?

Re: Unable to connect to mobile network when roaming

mkp — Thu, 09 Jul 2015 15:03:25 GMT

It is a z1. There are no network logos or apps. It was unassociated with any network when I bought it.

Re: Unable to connect to mobile network when roaming

Uliwooly — Thu, 09 Jul 2015 15:05:26 GMT

@mkp

That's quite odd, most likely the issue is the SIM card.

Re: Unable to connect to mobile network when roaming

Thommo — Thu, 09 Jul 2015 15:06:51 GMT

Dial *#*#7378423#*#* then open Service info then SIM lock and look for any markers like this [X] some txt then a number

Re: Unable to connect to mobile network when roaming

mkp — Thu, 09 Jul 2015 15:09:51 GMT

I enetered that code and there is nothing between the brackets. All the numbers after the text are zeros.

Re: Unable to connect to mobile network when roaming

mkp — Thu, 09 Jul 2015 15:54:57 GMT

Does anyone have any other suggestions?

Re: Unable to connect to mobile network when roaming

Uliwooly — Thu, 09 Jul 2015 16:24:52 GMT

@mkp

I was going to suggest to use a different SIM card, but that's not an option, I still think it's not the phone but your carrier issue.

Re: Unable to connect to mobile network when roaming

Thommo — Thu, 09 Jul 2015 16:30:23 GMT

Empty brackets and the number 0 means it's unlocked