Have you ever been asked, or ever wondered, âIs refrigerant, especially R-134a, heavier than air?â. Just this week I was asked this very question. Thinking I knew the answer right away, I was able to contain my natural, blurt-it-out style of an answer, at least until now.
Add a Contact to the Blocked List. Block someone from calling or texting you one of two ways: 1  To block someone who has been added to your phone's Contacts, go to. 2  The All Contacts window will appear where you can scroll through names to then tap the name of the contact you'd like to block.
Blocking Specific Numbers on a Landline. 1  1. Call your telephone service provider. 2  2. Dial *60 on your phone. 3  3. Add a phone number to be blocked.  4. Remove a phone number from your block 1  list. 5. Hang up the phone.