Well, the answer is a bit more complicated than a simple yes or no. As the primary account holder, you can view some information about the other lines on your plan, like their data usage or call logs. However, when it comes to text messages, things get a bit fuzzy.
T-Mobile's policy states that they don't provide access to the content of text messages, even for the primary account holder. This means you won't be able to see the actual messages being sent or received by other users on your plan. But, you might be able to see the number of texts sent and received, which can give you a rough idea of what's going on.
This might seem like a bummer for those who want to keep tabs on their family members or employees. But, it's actually a good thing for privacy and security reasons. I mean, who wants their private messages being snooped on, right? It's like having a private diary that's only accessible to you.
Can the Primary Account Holder View Text Messages T-Mobile? Inside