According to T-Mobile settings for their wifi modem router you can not change those settings. You'll have to by another device, maybe a wifi extender and change that to 2HZ. You have to add it to your current network.
Already have an account? Login
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.
Sorry, we're still checking this file's contents to make sure it's safe to download. Please try again in a few minutes.
Sorry, our virus scanner detected that this file isn't safe to download.