No, not yet. If you bought a new phone in the past year — such as a Samsung or Motorola phone — it will likely work with the new network. The same goes for most iPhones that are higher than the iPhone 6. These phones should receive the full new network experience.
However, if your current phone is not compatible with the new network, you do not need a new phone yet. Your current phone will continue to work with Twigby on the Sprint network until the end of 2021.
To check if your phone is compatible with Twigby’s new network, simply log into your Twigby account. Then click on "Account Settings" and scroll down to "Line Settings". If you have multiple lines on the account, select the correct line to move to the new network. You will then see an orange highlighted section that relays if the phone used with that line is compatible or not.