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.
Per call. 1  To hide your number when calling from a Mobile Phone, dial 1831 before the phone number you want to call. 2  To hide your number when calling from a Fixed Line Phone, dial 1831 or *31 before the phone number you want to call.ow to hide your number. You can request that your phone number is blocked from appearing on outgoing calls either permanently or on a per call basis. Please note, you cannot block your number on outgoing SMS / MMS messages.