SMS Features not working correctly

Hello,

I have set up my phone to be receiving sms alerts (reminders) but they aren't arriving at the appointed times. Usually most reminders will come in an hour before midnight. I can send text messages to weekplan and it'll get registered correctly, but this seems to be the only thing that is working correctly. Also, when I set up a reminder, I am seeing "You need to register your phone number. It is easy, follow these instructions" but I've already done this. 

Any idea on how to resolve this? Thanks