I am a current user of the Nielson Mobile Panel. I've been having trouble getting the nielson cell profile to successfully install on my iPhone 6 Plus. I was able to install the wifi profile without a problem. I read online that T-Mobile users may have to switch their APN to internet2.voicestream.com. Does anyone else have this problem? If not, can I change my APN and if so how?
I definitely had to Google what Nielson Mobile Panel lol.
Because it's a third party app I won't be able to offer much Support, but I can give you APN instructions!
Some probably not so good news is that they are probably already set up properly, iOS9 and later automatically fills the correct settings in for you. But just in case- T-Mobile Internet and MMS settings: Apple iPhone
Manage your T-Mobile account