After having noticed that UMTS networks are quite used for data in Lisbon, I went to a mobile shop today to ask for prices for UMTS Internet access. The person in the TMN shop told me that they sell UMTS notebook PCMCIA cards for 99 euros which can be used with different service options:
1) The card can be bought with with a service contract that can be canceled on a month´s notice with no minimal contract duration. It includes 2 GB of data traffic for 29.90 Euros a month.
2) Same conditions with a one year contract and the 2 GB are only billed between 5 p.m. and 7 a.m. During the day you surf without limitations. Not quite sure how that makes sense but that´s what he said even when I asked him to confirm.
Good prices, no wonder UMTS is used in this country.