We're all victims of bad reception every now and then. Reddit user psychuil points out that spelling alphabets can be a useful way to convey your address or name when you have a bad line.
Spelling alphabets use a word for each letter (hence "A for Alpha, B for Bravo" and so on). They're especially useful for similar-sounding letters, such as M and N, but also handy if there's iffy reception on your phone. (They're often also referred to as "phonetic alphabets", as in the image above, but that term is better used for systems that describe how to pronounce a word.)
If you want to prepare ahead of time, the site linked below will convert text into a variety of widely-used spelling alphabets.