Whilst recently in TUnisia, I aquired a Tunisia 'Holiday SIM' -
Holiday SIM
They cost DT10 and come with DT10 credit.
After asking in 2 or 3 shops, I was finally able to get data enabled and bought a 'package' - 1GB of data for the measly sum of DT10 -
Internet Mobile Tunisiana : le Web en toute mobilit...
Prepaids - FR: SFR; BE: BASE; PL:iPlus simdata UK: T-Mobile; International: SIM4Travel / Trupphone
Contract - UK: O2
Phones - Nokia 700
Phones in store - Nokia 5100, 3230, N70, 5500, N96, N95, 6230, 1100