No need for the supplied adaptor's 5.25v which [i] makes mdm
very hot = slower & less durable  [ii] wastes electricity & aircon
bill ; just (4.6 ÷ 5.25)² = 76.7 % of original wattage is needed.
Minimum voltage may be <4.6v.

Would this be a good place to ask whether there's any fax software
available, for use with either motherboard-based or external faxmodems,
for sending fax, under Windows Vista Home Premium? Free preferred.
I note with great regret that, unlike Win XP and earlier (or

I'm contemplating getting one of the "Air Cards" that plug into a USB
port, and provide high speed internet access via the cellular phone
system.  Plans are available for about the same price from three or four
cellular providers.