After updated to 1232.5957.1308.0000
Upon restore my phone from backup, I disable to installation of ACCESS POINT and make the below change to the MMS settings. My phone recover the ability of Internet Sharing.
Therefore, I suspect that after the installation of the Access Point and make the selection in Access Point (Active), this change disable the capability of Tethering.
My settings are as below:
DO NOT install ACCESS POINT
Go to Setting > Cellular
Add internet APN
Proxy server (URL)
fast.t-mobile.com
Proxy port
80
IP type
IPv4v6
Add mms APN
WAP gateway (URL)
wap.voicestream.com
WAP gateway port
80
MMSC (URL)
http://mms.msg.eng.t-mobile.com/mms/wapenc
MMSC port
80
Max MMS size
1024
IP type
IPv4



The above work for me and hope this also help others on TMO.
				
			Upon restore my phone from backup, I disable to installation of ACCESS POINT and make the below change to the MMS settings. My phone recover the ability of Internet Sharing.
Therefore, I suspect that after the installation of the Access Point and make the selection in Access Point (Active), this change disable the capability of Tethering.
My settings are as below:
DO NOT install ACCESS POINT
Go to Setting > Cellular
Add internet APN
Proxy server (URL)
fast.t-mobile.com
Proxy port
80
IP type
IPv4v6
Add mms APN
WAP gateway (URL)
wap.voicestream.com
WAP gateway port
80
MMSC (URL)
http://mms.msg.eng.t-mobile.com/mms/wapenc
MMSC port
80
Max MMS size
1024
IP type
IPv4



The above work for me and hope this also help others on TMO.
 
	 
 
		 Roam is a Canadian Re-seller of service for Canadians while in the US. Great concept, but there are some road blocks to get around before the Sharing will work.  Roam's deal with T-Mobile was to include the Internet Sharing apparently.   I was told that MMS was simply not going to be available.    I will see what I can make happen with your settings, my Roam SIM and *611 support (apparently it will be T-Mobile).
  Roam is a Canadian Re-seller of service for Canadians while in the US. Great concept, but there are some road blocks to get around before the Sharing will work.  Roam's deal with T-Mobile was to include the Internet Sharing apparently.   I was told that MMS was simply not going to be available.    I will see what I can make happen with your settings, my Roam SIM and *611 support (apparently it will be T-Mobile). 
 
		 
 
		 
 
		
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