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There are 12 notes in most Western music. When you double a frequency you go up an octave, but keep the same note.
Music is played in different “keys” though with 7-note scales, with letters assigned A-G. If you play the notes in order starting and ending at the letter for which the scale is named, then do the same for a different scale, the relationship between the notes will sound the same between the 2 scales, but your starting and ending pitch will be different.
Piano keys are arranged with all 12 notes being available, but arranged in the key of C-major or A-minor, where all notes are natural notes (no sharps or flats).
If you play just the white keys starting from C, you’ll be playing a C-major scale : C, D, E, F, G, A, and B. However, to play the F-major scale, you’re going to need to skip one white key and hit a black key: (F, G, A, Bb, C, D, and E). No letter repeats on a scale.
A sharp (#) or flat (b) note is just moving the smallest step you can to the right or left, respectively. For most notes, that’s moving to a black key, but there’s no black key between B and C or E and F sometimes it’s moving to another white key.
Why don’t we just ignore weird notes like Cb? Because every letter needs to be represented on a scale. Ab-minor, for instance has Ab, Bb, Cb, Db, Eb, Fb, and Gb. So even though Cb is the same frequency as B-natural, it serves the same role in the scale as E does in the key of C, and if you didn’t represent it as a flat note, your scale would have 2 "B"s and no “C.”
This gets even more important when you get into different instruments with different natural keys. A Piano, flute, bassoon, and other instruments are what we call “Concert C” instruments, which means they have the same natural key of C. However, other instruments are different.
A standard clarinet is a Bb instrument, meaning its Bb scale matches the C scale of a piano. You also have Eb-clarinets that are a little smaller, meaning that if they play a “C” they’ll be playing a concert Eb, which uses the same fingerings as a Concert Bb from a standard clarinet.
So when an Orchestra is playing something in the key of A-major (A, B, C#, D, E, F#, G#), an Eb-clarinet is playing in F#-major (F#, G#, A#, B, C#, D#, E#).
Carriers will offer better deals on the phones though if you’re planning to stick with them.
I’m looking at a $1000 phone that ATT will give me for 2.99/month for 2 years. That’s over 85% off on the phone. The trick is they give it to you by actually charging like $42/month, but then giving a $39 credit every bill for 2 years, so you have to pay the difference on the $1,000 phone if you jump carriers.
But since they’re the only carrier that works at my office, and this is gonna be a work phone (my company pays me a monthly stipend for it), I can live with that.