HAVING PROBLEMS WITH MY YESTEL 5C

You chould contact your cellular provider and ask them for it.

or you could try these:
Name: ATT
APN: wap.cingular
Proxy: <Leave in Blank>
Port: <Leave in Blank>
Username: [email protected]
Password: cingular1
Server: <Leave in Blank>
MMSC: http://mmsc.cingular.com
MMS proxy: wireless.cingular.com
MMS port: 80
MCC: 310
MNC: 410
Authentication type: <Leave in Blank>
APN type: default,supl,mms
APN Protocol: Leave it to the Default one

Taken from here:
https://apn-settings.com/us/att-apn-settings/

Here are the settings I found: APN Name Verizon APN vzwinternet Proxy Port Username Password Server MMSC http://mms.vtext.com/servlets/mms MMS Proxy MMS Port MCC MNC Authentication Type APN Type internet+mms APN Protocol APN Roaming Protocol Bearer MVNO Type Alternate Settings APN Name Verizon APN internet Proxy Port Username Password Server MMSC http://mms.vtext.com/servlets/mms MMS Proxy MMS Port MCC MNC Authentication Type APN Type internet+mms APN Protocol APN Roaming Protocol Bearer MVNO Type

Go to Settings>Mobile data>Access point names then press Menu and select New APN. Then enter these settings:

Name: Life Internet
APN: tslpaymnet
Proxy: 'Leave blank'
Port: 'Leave Blank'
Username: 'Leave Blank'
Password: 'Leave Blank'
Server: 'Leave Blank'
MMSC: http://mms/
MMS Proxy: 193.35.133.194
MMS Port: 8080
MMS Protocol: 'Leave Blank'
MCC: 234
MNC: 33
Authentication type: PAP
APN Type: internet+mms

Name: STRAIGHT TALK (or just any name you would like to use)
APN: tfdata
Proxy: proxy.mvno.tracfone.com
Port: <Leave in Blank>
Username: <Leave in Blank>
Password: <Leave in Blank>
Server: <Leave in Blank>
MMSC: http://mms-tf.net
MMS proxy: mms3.tracfone.com
MMS port: 80
MCC: 310
MNC: 410
Authentication type: <Leave in Blank>
APN type: default,supl,mms
APN Protocol: Leave it to the Default one

try this one

had the problem going through forums trying to find the settings that work for my phone but to no success but I finally figured it out and I'm posting it on here just in case some one else has my same problem.
I had to create two separate APN's one for internet and one for MMS. Settings are as follows:
Internet:
Name: Straight Talk Internet
APN: att.mvno
Proxy: proxy.mvno.tracfone.com
Port: 80
User Name: Not Set
Password: Not Set
Server: Not Set
MMSC: Not Set
MMS Proxy: Not Set
MMS Port: Not Set
MCC: 310
MNC: 410
Authentication Type: PAP or CHAP
APN Type: Internet
APN Protocol: IPv4
Bearer: Unspecified
MMS
Name: Straight Talk MMS
APN: att.mvno
Proxy: Not Set
Port: Not Set
User Name: Not Set
Password: Not Set
Server: Not Set
MMSC: http://mmsc.cingular.com
MMS Proxy: 66.209.11.33
MMS Port: 80
MCC: 310
MNC: 410
Authentication Type: PAP or CHAP
APN Type: Internet+MMS
APN Protocol: IPv4
Bearer: Unspecified
Do not forget to create two separate APN's!!!!!


goodluck

Internet settings

APN - Access Point Name: giffgaff.com
Login - Username: giffgaff
Password: [leave blank]
Proxy: [leave blank]
MCC: 234
MNC: 10

MMS settings

APN - Access Point Name: giffgaff.com
Username: giffgaff
Password: [leave blank]
Server: http://mmsc.mediamessaging.co.uk:8002
MMSC: http://mmsc.mediamessaging.co.uk:8002
MMS proxy: 82.132.254.1
MMS port: 8080
MCC: 234
MNC: 10
APN type: mms

Straight Talk AT&T APN Name ATT 4G LTE APN tfdata Proxy proxy.mobile.att.net Port Username Password Server MMSC http://mmsc.mobile.att.net MMS Proxy proxy.mobile.att.net MMS Port MCC MNC Authentication Type PAP APN Type default,mms,supl,hipri APN Protocol IPv4

I found these settings, not sure if they will work but you can give them a try.

Enter these settings
Name: NET10
Apn: tfdata
Port: 80
Mmsc: http://mms-tf.net
Mms proxy: mms3.tracfone.com
Mms port:80

or :
Name: AT&T MVNO
APN: wap.tracfone
Proxy: att2.tracfone.com
Port: 80
UN: EMPTY
PW: EMPTY
Server: EMPTY
MMSC: http://mmsc.cingular.com
MMS Proxy: att2.tracfone.com
MMS Port: 80
MCC: 310
MNC: 410
Auth Type: EMPTY
APN Type: internet+mms+supl

and finally, you can try the settings posted in this link, they may help.
http://forums.wpcentral.com/windows-phone-7/226267-net10-apn-settings-really-work.html#post1987074

Lewis

Hi,

The android setting is given below:

Name: M1 MMS APN: miworld (all lowercase) Proxy: http://wap.miworld.com.sg Port: 8081 Username: 65 Password: user123 (lowercase) Server: http://mmsgw:8002 (no slash behind....) MMSC: http://mmsgw:8002 MMS Proxy: 172.16.14.10 MMS Port: 8080 MCC: 525 MNC: 03 Authentication Type: PAPAPN Type: mms (lowercase

This is cynanogenmod setting
Name: Rogers
APN: rogers-core-appl1.apn
Proxy:
Port:
Username:
Password:
Server:
MMSC:
MMS proxy:
MMS port:
MMC: 302 (might be different - is auto-set by your SIM card)
MNC: 720 (might be 72 - is auto0set by your SIM card)
Authentication type:
APN type:
APN protocol: IPv4

Regards

For the normal at&t apn settings, or also called at&t wap settings, these are the values you should use
Name: ATT
APN: wap.cingular
Proxy: <Leave in Blank>
Port: <Leave in Blank>
Username: [email protected]
Password: cingular1
Server: <Leave in Blank>
MMSC: http://mmsc.cingular.com
MMS proxy: wireless.cingular.com
MMS port: 80
MCC: 310
MNC: 410
Authentication type: <Leave in Blank>
APN type: default,supl,mms
APN Protocol: Leave it to the Default one

at&t apn settings 4Gdetails: If you have a 4G phone (e.g. iPhone 5, Galaxy S4, HTC one, etc) you should try using these at&t apn settings 4G. They run faster and more stable connections.
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
APN Protocol: Leave it to the Default one
Bearer: leave it to the Default one at apn settings Step by Step Configuration