Northcape Said:
"Why Can't I Receive Texts from Several People: Hello. This is my first time using this service. My problem is this. I don't receive text message replies from 2 people for certain and there may be more than I am unaware of.[...]"
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Troubleshooting Blocked Callers:
Three things to try:
A. Contact your Carrier:
Ask you Carrier for assistance with this. Perhaps it is a mishap on their end?
B. "Unblock this Caller":
Add this personal as a contact. If they already are one, then select them from your Contact list of the Phone app, and then scroll to the very-bottom of their profile and tap: "Unblock this Caller"
C. Uninstall Security Software:
Also, do you have any third-party Security Software on your device? If so, a filter on it may be blocking it out. So, uninstall this app from your device. Security Software just gets in the way on an Apple device, and this is a pure example of how and why.