Network recognises SIM card and modem, but still cannot connect. but the

Question

I have a Huawei E 220 modem. After downloading a duff Vodafone update, I lost my connection and even with fresh software could never quite get the modem to connect, even though it was speaking to the network. I´ve changed to another provider Telefonica Movistar in Spain (who own O2 in the rest of Europe), and this shows in the program window that I have 3G connection, a good signal, the Sim card is recognised, and that I am registered. However when I ask it to connect, it gives to error messages, the first of which is that it has not been possible to start the "Tool" and the next asking me to check the connection and start again. Unlike the Vodafone program there are no obvious windows allowing you to alter phone numbers or security codes (in fact there don´t seem to be any).
Has anyone any idea what has gone wrong? I´ve deinstalled the and reinstalled both programs a number of times. Everything works fine until I click to connect to the internet.
All I can think of is that there is something left somewhere from the duff program, but I have no idea where to look for it.

Answer 1

Thanks for the reply.
I went through all the settings in Internet Connect including preferences with the Vodafone set up, and they were eventually all correct, even though for some reason the number of asterisks in the coded sections seems to bear no relation to how many characters you entered . The modem was connecting to the network, went to "authenticating", and then could not "negotiate" a connection.
In the new system with Telefonica, i can´t work out if it connects to Internet Connect, or is entirely self contained. I think the latter, as there are no settings in the Internet Connection which refer to it (Actually I had wiped every setting I could find before installing in case old Vodafone settings might be causing the problem). As it is, the blue light flashes, indicating a high Speed connection and the Movistar pane shows a good connection, that the card is "registrado" which I think means connected, but it then fails at the authentication point, just like Vodafone. As I understand the error messages, which are in Spanish, it then seems to think that the modem is not correctly installed and asks me to check the connections again. The preferences window for this Movistar program does not give you the option of entering phone numbers or passwords, other than the Sim card code which you get on any mobile phone and which is not network relevant.
other than that and choosing what service you want from it and the connection sppeds which are set to mobile internet and automatic respectively, the movistar set up doesn´t give away any options.
it seems to me that there is some simple software setting problem that remains from the duff program, but I just can´t work out where it might be. The first time I tried to solve a mobile modem program problem (which eventually was solved by downloading a later version of the mobile software), i ended up losing one of the core OSX prgrams, which I assumed was a part of the mobile modem set-up, and I don´t want to do that again. One of the weaknesses of the Apple support and problem solving system is that it does rather depend on you having internet access. When access is actuallay the problem and you have to go out to internet cafes and find solutions using cranky windows machines and internet expolorer which doesn´t seem to work seamlessly with Apple pages, it really gets to be longwinded drag.