agent_s87,
It isn't a special font. It is one of the symbols included with many fonts. On a Mac it is Shift-Option-K, it might be possible with a combination of Alt-and numeric keypad characters on a PC, but I am not sure what they are.
The storage space on a SIM card has several limitations. First, it is small. Second, it stores entries with one address/number per entry. Some phones will group entries by the same name to get around this restrictions.
On the other hand the iPhone has at least 4GB of storage, several thousand times the storage available on a SIM card.
Hope this helps,
Nathan C.