I have a Focus S, which I love. The problem with Tango is that it comes back with a "Registration Failed". It says my network seems to be blocking the registration. If someone has been thru this and could help that would be great.
It does have a SIM card. It was working for a week and then two days ago it stopped working. I unistalled it as well. I sent Tango a message but who knows how that will go.
I installed it on 3 phones yesterday, 2 in Calif. and one in Texas. All were wifi installs. Didn't have a single problem, in fact, registration was too easy. Doesn't help you, but letting you know there isn't a widespread problem for me.