Hello Pascal,

  PS> Yes. GSM comes in two variants, one operating around 900MHz, the
    > other at about 1800MHz. However, only really old cell phones
    > don't work with both. Another nice thing is of course that the
    > rest of Europe also has GSM networks, so one can still use their
    > cell phone even when abroad. Most of the carriers have roaming
    > agreements.

Nice.  Over here it's common to have to replace your cellphone and all
accessories if you change to a provider that uses an incompatible network -
wasting yet more money.

- Andy Ball

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