3 people don't receive my texts. They have Android phones. I can receive their texts. They are either on T-mobile or ATT. I have deleted their contact and reentered it using only their 10 digit number. I have sent them a text by manually inputing their number instead of using their contact. I have restored my phone on iTunes to factory spec and restored from backup. Their numbers are not blocked or blacklisted. I have done everything that tech support told me to do over several hours on the phone with them. The Android users have deleted my contact to see if it was possibly blocked, text doesn't arrive. The Android users are able to get texts from the same model iPhone that we have that is on ATT. I tried turning off iMessage. Don't know what else to do.Verizon Wireless Customer Support