Just realized what I tried was for AT&T. I have T-Mobile. :smokingsomb: Below is straight from the web and helped me out:
Per T-Mobile:
Resolution Steps
Check settings and reset APN
Checking mobile network settings and resetting the APN resolves the majority of issues, and is much faster than verifying all settings.
If you have a battery saver app, check its settings. Some battery saver apps disable the APNs or data connection when the battery level gets low. You need to adjust these settings or uninstall the app to keep the data connection working
From the Home screen, press the Menu key.
Touch Settings.
Touch Wireless & networks. Depends on software version
Note: This varies on different software versions.
Android 1.6: Wireless Controls.
Garminfone: Wireless Manager.
Behold II: Phone Information.
Verify that the Airplane Mode or Flight Mode check box is cleared.
If you see a Mobile Network check box, verify it is selected.
Touch Mobile Networks.
If you see the following check boxes, verify they are selected:
Data Enabled
Use Packet Data
Data Roaming This will incur charges if you roam internationally, but it is required to receive data when roaming domestically.
Touch Access Point Names or APNs.
Press the Menu key.
Touch Reset to default.
From the Home screen, press the Menu key.
Touch Settings.
Touch Wireless & networks. Depends on software version
Note: This varies on different software versions.
Android 1.6: Wireless Controls.
Garminfone: Wireless Manager.
Behold II: Phone Information.
Touch Mobile Networks.
Touch Access Point Names or APNs.
If there is a T-Mobile APN, touch it. If not, press the Menu key, and touch New APN.
Verify and update the following settings for the Data APN:
Name: T-Mobile
APN: epc.tmobile.com
Proxy: <Not set>
Port: <Not set>
Username: <Not set>
Password: <Not set>
Server: <Not set>
MMSC:
http://mms.msg.eng.t-mobile.com/mms/wapenc
MMS proxy: <Not set>
MMS port: <Not set>
MMS protocol: WAP 2.0
MCC: 310
MNC: 260
Authentication type: <Not set>
APN type: <Not Set> OR Internet+MMS (depending on software version)
Press the Menu key.
Touch Save.
In the list of APNs, delete all others that may appear. If there is a FOTA APN, you may leave that one. To do this:
Touch the APN you want to delete.
Press the Menu key.
Touch Delete APN.
Verify that there is a circle next to the one remaining APN to show it is activated.
Perform a soft reset.
Test your data connection, by accessing a web page or sending a picture message (MMS).
I'm having problems connecting to 4G. It's been a few weeks and I haven't really noticed until today, since I'm usually connected through wifi.
For me, it says "APN Empty". I tried entering all the information below then hit save and it reverted back to the "APN Empty/Add an APN?" page. When typing all the info. in, it already had MCC & MNC numbers. Those were:
MCC: 310
MNC 260
I changed the numbers to the ones below when trying to add the APN. (Could this be because I have a different phone?? I'm phone illiterate..sorry!)
Help! I have a Sidekick 4G.