I have the unlocked SM-G900T with the Marshmallow OS, and I am using it with AT&T service..
All seems well after setting up the APN, except one oddity.
The WiFi Calling doesn't work. When attempting activate WiFi Calling, it indicates "Er05 - Invalid SIM".
I went to AT&T, and they changed the SIM, no help. The Samsung rep at BestBuy indicated he had no idead, but he suspected it was an issue with a T-Mobile phone being used on an AT&T network?
I searched the forums, both here and abroad and haven't found any solution yet.
Any ideas on how to fix this, or if it's even possible?
Maybe I should just install one of the Google Phone apps?
Thanks in advance...
P.s. I got the APN settings from AT&T, and they matched here under :
http://apn-settings.com/us/att-apn-settings/
Name: ATT HSPA+
APN: phone
Proxy: <Leave in Blank>
Port: <Leave in Blank>
Username: <Leave in Blank>
Password: <Leave in Blank>
Server: <Leave in Blank>
MMSC: http://mmsc.mobile.att.net
MMS proxy: proxy.mobile.att.net
MMS port: 80
MCC: 310
MNC: 410
Authentication type: <Leave in Blank>
APN type: default,supl,mms,hipri, fodo
APN Protocol: Leave it to the Default one
Bearer: leave it to the Default one
All seems well after setting up the APN, except one oddity.
The WiFi Calling doesn't work. When attempting activate WiFi Calling, it indicates "Er05 - Invalid SIM".
I went to AT&T, and they changed the SIM, no help. The Samsung rep at BestBuy indicated he had no idead, but he suspected it was an issue with a T-Mobile phone being used on an AT&T network?
I searched the forums, both here and abroad and haven't found any solution yet.
Any ideas on how to fix this, or if it's even possible?
Maybe I should just install one of the Google Phone apps?
Thanks in advance...
P.s. I got the APN settings from AT&T, and they matched here under :
http://apn-settings.com/us/att-apn-settings/
Name: ATT HSPA+
APN: phone
Proxy: <Leave in Blank>
Port: <Leave in Blank>
Username: <Leave in Blank>
Password: <Leave in Blank>
Server: <Leave in Blank>
MMSC: http://mmsc.mobile.att.net
MMS proxy: proxy.mobile.att.net
MMS port: 80
MCC: 310
MNC: 410
Authentication type: <Leave in Blank>
APN type: default,supl,mms,hipri, fodo
APN Protocol: Leave it to the Default one
Bearer: leave it to the Default one