Since Vodafone PT isn't listed, I went and gathered all the information I could, soooooo here it is:
Service: Vodafone Portugal
How to: email@example.com
Limits: It depends on the mobile phone, if it supports EMS, than you can type whatever you like, if it only supports SMS, then restrain yourself to 160c. There are no limits to a number of messages that you can receive.