I see this thread has died although there are still unanswered questions.
So here's un update.
First of all, the voice plans advertised on Prima's website are only for San Marino residents and San Marino citizens.
Non-residents/citizens (including Italians) are not allowed to subscribe those offers.
For them, there exists a non-advertised tarif plan called "ScattoZero International", which costs 26 or 28 c/min.
Then, pre-paid cards should have been available by September 2007, then the launch had been postponed to November, then December...
Last time I asked (mid-February) I have been told that in March/April prepaid cards should finally be available, although no information is at the moment available regarding its costs and features.
Roaming
Roaming is available not just in Italy but also in other countries and it needs to be activated manuallly.
This means that outside Italy and San Marino, one needs to navigate the menu of the phone and switch the roaming on. When back to Italy/San Marino, roaming needs to be switched off. The SIM will not work in Italy/San Marino when roaming is on. That's curious...
Roaming charges are not advertised (excepted for - maybe - inbound calls which *may* be assumed to cost the same as calls from San Marino to the country where one is roaming).
I hope this is the case because I have been roaming a lot!
Of course, San Marino Telecom is not bound by EU's GSM tarif regulations.
Calling to San Marino Telecom
As previously noted, calls to San Marino mobile network (+378 6) are usually priced as calls to landlines (or slightly more).
However, almost
no foreign operator allows calls to +3786* numbers!
No French carrier; no Belgian carrier (excluding Proximus); ...
This leads to the freaking experience where you call someone with your Prima number and your correspondent cannot call you back (s/he will hear a message from its operator saying the number is not valid...).
Does anyone know why?
KR's