Frakk! I posted this on my own page >.<
:o
To be honest I don't really know about that (since I never really thought about those), but I might know about the Ihr/Ihre issue. Although this is just a guess. In the German language nouns have a genus. And depending on the object's genus in the sentence you use Ihr or Ihre.
In your example Name - der Name is masculine, so you use Ihr here. Telefonnummer - die Telefonnumer has feminine genus, so you use Ihre here. << Don't know if this is a rule, but I "proof-checked" with other words.
I am sorry that I am not really any helpful.. Should I find out about Wie <=> Was, I will tell you.