Number 6 is super easy. Have you never owned one of those old phones?
I've owned one. Loved my indestructible Nokia.
First I thought that it's a single word which isn't existing in my non-native english vocabulary so far.
My second thought was that it's maybe more or less of a sentence with modern or old abbreviations.
Still no solution in sight. I've read the thread then in hope of a hint.
hb2007 even mentioned T9 aka the built in dictionaries.
At least for me it means the same because when I used the dictionary
on my old phone it displayed T9 then (T9 just stands for Text on 9 keys).
So I was sure that I'm searching in the right direction.
Then I tried two different T9 decoders which I found online.
Both didn't find a single word with the whole number.
So I tried to segment the number in both decoders to may get a clue what's the message.
After that step didn't help I thought that it's maybe not T9 and the quantity of the numbers leads to a single letter.
Like it was with the even older mobile phones before the implemented dictionaries.
For some reason my brain thought that it's a good idea to count the 2 twice.
XTRB? Google then brought me to fishing gear.
Took me another 5 minutes to realize my mistake.
What a journey with such a simple solution.
What do you think?
I'm not a puzzle fan. After overcomplicating number 6 so hard I'm already done.
Maybe my wife will give it a try. She's a puzzle junkie.
Despite of me being not a puzzle fan it's imo a great project.