Safaricom in Kenya is offering 700 MB/month for 1999 Kenyan shillings which is 18.80 euros.

GDP in Kenya is $1445 per capita which would be 75 eur/month. So clearly mobile internet access is not cheap at all. Cellular to landline costs 25 shillings/min which means that 80 minutes of landline call equals 700 MB of data. 80 minutes if voice at 25 kbps is 15 MB, so maybe data plan is not so expensive after all