Transferring Phones From Verizon Wireless to AT&T Wireless

To transfer an iPhone 5 or newer:

Obtain a SIM card from AT&T wireless and replace the SIM card in the phone
Gently insert the end of  small paperclip into the small pinhole opening in the SIM tray.
Apply a small amount of pressure until the SIM tray pops out
Grab hold of the SIM tray and pull straight out

This video shows how to remove the SIM card: https://www.youtube.com/watch?v=2mvQlUBGDaM

dump the old SIM card from the tray
insert the new SIM card into the tray
insert the SIM tray back into the phone
restart the phone

To transfer a Samsung Galaxy S5 or newer:

Obtain a SIM card from AT&T wireless and replace the SIM card in the phone
Gently insert the end of  small paperclip into the small pinhole opening in the SIM tray.
Apply a small amount of pressure until the SIM tray pops out
Grab hold of the SIM tray and pull straight out

This video shows how to remove the SIM card: https://www.youtube.com/watch?v=2mvQlUBGDaM

dump the old SIM card from the tray
insert the new SIM card into the tray
insert the SIM tray back into the phone
restart the phone

Program the data settings in the phone for the AT&T network:

Access the Settings menu.
Locate and select either Wireless & Networks, More Networks, or Connections.
Select Mobile Networks > Access Point Names.
Locate and select the option to add a new APN  by pressing the + symbol on the screen
Program each field using the settings below:

Name NXTGENPHONE
APN NXTGENPHONE
MMSC http://mmsc.mobile.att.net
MMS proxy proxy.mobile.att.net t 
MMS port 80
MCC 310
MNC 410
APN type default,mms,supl,hipri
APN protocol IPv4


Save the changes to return to the APN's menu and select the new APN.