Hello Marten,
do you know "Village Telco"?
http://www.villagetelco.org/
They use wifi for data and voice connections in a mesh network with
low-cost hardware and open source software. Primary for voip (asterisk).
E.g. they have set up containers with their hardware in south africa.
May be an other / alternative way :)
--
Regards,
Benny
gpg 0xFC505AB0
jabber benny(a)benny.de
sip benny(a)benny.de