In a zip code like 04843, the initial zero is a necessary part of the Zip code—but if you import a CSV or TSV file with 04843 in a field by itself, Numbers (like Excel) automatically treats it ...

You have to opt-in for short codes. For example, you can text News to 57500, and boom, you're signed up for KSL NewsRadio news alerts. ... many by simply texting STOP to the short code number.