When I send the message, the person receives the message and in parentheses (sent with confetti), but they don't see the confetti effect. Why?

Nothing happens. A gift card is like cash, the person who gave it to you will have no way of knowing what you did or did not do with it...

Try using another phone number other than the phone number you are trying to log into.

It should only display that message if the phone is not on iOS 10. If the phone is fully updated, try asking someone at the Apple store.

Sign-in to your email account. If you have multiple email accounts, choose your desired account. Scroll down to the “Sent Mail” folder. Locate the mail you sent. You will find...

Most mail is sorted by barcode-reading machines these days. In addition to lining out your name and address with ink, completely obliterate the first inch or so of the barcode...