1. No, Primus Saver Option 2 is a CPS (Carrier PreSelect) calls provider.
CPS means that, although you keep your BT landline, pay 'line rental' to BT (BT Together Option 1 is the minimum) and your
incoming calls still arrive on BT (so Caller Display, 1471* and
1571* work normally), you will have opted to have the BT exchange programmed so that, by default, (nearly) all your
outgoing calls are sent via the CPS provider (and BT don't even 'see' the calls even though they carry the first leg).
The 'default' part of that sentence is the key to CPS. It means that, if you want, you can use a prefix to send an individual call via
another provider (i.e. override the CPS programming for a single call). For example, using
just a 1280 prefix will send that call out via BT, using
just a 18185 prefix (not 128018185) will send that call out via
www.18185.co.uk and so on.
In other words, CPS allows you still to pick the best carrier for your calls even though you've opted,
normally, to use one provider (e.g. Primus Saver Option 2 because of the free evening and weekend UK 01/02 calls).
If you don't have to make many weekday daytime UK 01/02 calls (and the few that you do make are made for 5p each, regardless of duration, using 18185), it reduces your call costs to almost nothing.
* Don't dial 3 after checking who called on 1471 or dial 0 after checking a
1571 message (even though that nice BT lady's voice invites you to do so and it seems like the easy way to return the call). If your do, BT will charge you 7½p
regardless of whether the call is connected or not.
Primus are now offering line rental too. It is not recommended to move your line rental away from BT though.
2. Yes, you'll receive an e-mail each month and can view/download your invoice online.
3. There isn't one. They are hoping that, having dangled the free E&W UK 01/02 calls carrot, you'll then make your other calls via them too. Don't.
Instead, have a read of my
'6-steps' to reducing costs for BT residential landline subscribersand save as much as you can!