Experia Arc S Cannot Connect to AT&T 3G

[pcrkbr]

This is probably not a new issue but I appreciate any input.  I have been trying to set up a new Xperia Arc S to work on ATT's network.  The phone works fine, it will send text and access internet while in a wireless area but it does not recognize or is not recognized by ATT's 3g network.  In talking with ATT multiple times, I have not found the answer and during the last call, the individual said they do not support non-ATT phones.  The model is LT18a.  Any suggestions?  Thanks!

[Uliwooly]

get a brand new AT&T SIM card, also is it an LT18a (check the back of the phone behind the battery)?

get the correct APN settings and do NOT install any

taskiller, antivirus, ram apps, battery apps, boost apps

is Sony spying on users in this forum?

http://talk.sonymobile.com/thread/60197

Don't forget to mark the Correct Answers & Helpful Answers

UNRELATED topic, if you have some time please check this thread

http://talk.sonymobile.com/message/244522#244522

[Uliwooly]

settings -> wireless & networks -> mobile networks -> access point names -> MENU -> add New

Name: AT&T

APN: wap.cingular

Proxy: leave blank

Port: leave blank

Username:WAP@CINGULARGPRS.COM

Password:CINGULAR1

Server: leave blank

MMSC: http://mmsc.cingular.com

MMS Proxy: wireless.cingular.com

MMS Port: 80

MCC:310

MNC:410

APN Type: leave blank

MENU -> Save

is Sony spying on users in this forum?

http://talk.sonymobile.com/thread/60197

Don't forget to mark the Correct Answers & Helpful Answers

UNRELATED topic, if you have some time please check this thread

http://talk.sonymobile.com/message/244522#244522

[pcrkbr]

Hi uliwooly...we did get a new sim card ...actually have tried two and I checked your suggested settings against what I had for the apn and that is what I have.... 😞

[Uliwooly]

so it is an LT18a ? because you can flash the LT18a firmware to an LT18i and if you go to settings > about phone it will say LT18a even if it is an LT18i, as you should know the LT18i won't work with AT&T 3G frequencies.

is Sony spying on users in this forum?

http://talk.sonymobile.com/thread/60197

Don't forget to mark the Correct Answers & Helpful Answers

UNRELATED topic, if you have some time please check this thread

http://talk.sonymobile.com/message/244522#244522

[Uliwooly · Accepted solution]

I would suggest this

1st repair your phone with SUS w/o your SIM card

2nd remove mcafee

3rd insert the SIM card

4th Enter the APN settings manually

Update Service (SUS)

http://www.sonymobile.com/gb/tools/update-service/

http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe

http://software.sonymobile.com/install_packs/Update_Service_Setup-2.12.12.41.exe

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355

is Sony spying on users in this forum?

http://talk.sonymobile.com/thread/60197

Don't forget to mark the Correct Answers & Helpful Answers

UNRELATED topic, if you have some time please check this thread

http://talk.sonymobile.com/message/244522#244522

[pcrkbr]

Under the battery says LT18a and also in settings.  I updated the phone to the latest software 4.0.3..  I am actually going over to ATT to get yet another sim card to make sure.  Sorry but how do I remove mcafee?  Once I get the new sim card, I will pull it out and do the second link above.

[Uliwooly]

simple

open the app drawer > look for mcafee > tap on the square made of 4 smaller squares > uninstall mcafee

or

settings > apps > all > mcafee > uninstall

is Sony spying on users in this forum?

http://talk.sonymobile.com/thread/60197

Don't forget to mark the Correct Answers & Helpful Answers

UNRELATED topic, if you have some time please check this thread

http://talk.sonymobile.com/message/244522#244522

[Uliwooly]

you know you can manually update to 4.0.4

How to manually update 2011 Xperias to android 4.0.4 build number 4.1.B.587 & others

http://talk.sonymobile.com/thread/38251

is Sony spying on users in this forum?

http://talk.sonymobile.com/thread/60197

Don't forget to mark the Correct Answers & Helpful Answers

UNRELATED topic, if you have some time please check this thread

http://talk.sonymobile.com/message/244522#244522

[pcrkbr]

Question...do I do all three of the below or any specific one?  I have removed the sim card and re attached to the computer.  We have removed mcafee as well.