Thank you for posting your concern in the Community, not receiving the texts from the service like Uber and PayPal can be quite inconvenient. To receive texts from short codes, they must be listed in the approved short code programs list available at CWTA's website.
I see Uber has three codes, and PayPal has one code listed. From which short codes texts not received? As suggested in the response above, you can send 'HELP' or 'INFO' to the short code and should receive a response providing additional info.
If you are not receiving texts from the listed short code, please send us a private message at @CommunityHelps. You can find details about our private messaging in this blog.