It's obviously TuGo that's not handling the silent text properly. If anyone has a support case open with o2 you might want to ask them to focus on that.
iMessage lets you send text messages, photos, and videos to other iOS devices or Macs over Wi-Fi. With iMessage you can also see when someone is replying to ...
I CAN activate iMessage if I sign in during initial setup, and choose email instead of phone, but it always fails to verify if I choose my phone number ...