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I'm going to assume you have opted for the free Sky Talk Freetime package and have (sensibly IMHO) left your line rental with BT (i.e. are just using the Sky package as your CPS calls provider).
If so, just the 1280 prefix will allow you to 'hop back onto BT' for an individual call (i.e. one for which BT is cheaper) and just the 18185 prefix will allow you to make an individual call via 18185.
Opting for a CPS means you have the BT exchange programmed to, by default, send your calls via the CPS provider instead of BT. Using a 1280 prefix overrides that programming for a single call and sends that call via BT. Similarly, using a 18185 prefix overrides that programming for a single call and sends that call via 18185.
Only chargeable calls prefixed with just 1280 will 'count' towards 'nearly free' caller display.
I always recommend gateway providers' numbers (0844/0871) are prefixed with 1280 so that the well-published BT charges for such calls appear on your BT bill, rather than the difficult-to-find (and possibly more expensive) CPS providers' rates being charged.
The 'short mobile calls' comment in paragraph  in my 6-steps only applies to those who are on Primus Saver Option 2 CPS with the Penny Mobile 2 add-on as recommended in paragraph . As you're on Sky Talk CPS instead, I'd recommend all your calls to UK mobiles are routed via 18185.
I live in a village of about 2½ thousand homes and take the cowards' option of sticking with BT for landline and broadband (but you know my calls provider choices). When there's no competition, getting a reliable service is top of my list.
Having said that, I have managed to negotiate the cost of my (approx 8mb) BT Total Broadband 1 down a fair bit (I'm currently paying the equivalent of £11.99/month on an 18 month contract and have recently received a new router f.o.c.).
The only thing I would mention to you is that, if you 'hand over' your line rental to Primus, they would then have the ability to bar your access to the likes of 1899 and 18185 and you'd lose the ability to dial the 1280 prefix to send certain calls out on BT (e.g. some 0845/0870 calls - for which Primus charges BT's un-discounted rates).
Additionally, if you ever wanted to return to BT, it's (increasingly, it seems) possible that they'd charge you £124.99 (or the going rate at the time) for reconnection.
The disadvantages of remaining on BT's Unlimited Evening & Weekend Call Plan - formerly known at BT Together Option 2 (i.e. not opting for Primus Saver Option 2 / Penny Mobile 2 CPS too) are:
a) Free UK 01/02/03 evening and weekend calls are limited to 60 minutes each instead of 90 minutes;
b) Calls to UK mobiles of up to 20 minutes for a flat rate 20p are not available
c) You have to sign to sign up to a 12 month rolling contract to get the free evening calls without paying the additional monthly fee, which for all intents and purposes is contract in perpituity! Why tie yourself in (and possibly restrict yourself with other options) when with Primus you only need a month's notice?
d) The free evening weekday calls end at 6am with BT. With Primus they end at 8AM. No contest!
Yes, it appears BT Wholesale is now offering a calls package to CPS providers which somehow allows them to 'ignore' a 1280 prefix dialled by the end-user. I believe Sky and Talk Talk are making use of the new money-making opportunity.
I think it would be an interesting test case if someone challenged BT Retail, who sells the line rental with at least their Unlimited Weekend Calls Plan to the CPS customer, alleging they are in breach of contract in that the customer is prevented from making use of that Calls Plan.
I can't be bothered at the moment though - Primus are not changing to that system (yet).
Does Sky Talk CPS also "ignore" 18185 prefix calls. I'd like to be able to have the the FREE calls to UK Landlines and 20 various countries for only £5.00 per month through "Sky Talk Unlimited" but still be able to use 18185 for other countries. Also, assume I would still be able to route 0844 "callthroughs" via SKY at the same prices I'm currently paying BT.
With regard to 0844 gateways, I don't know whether Sky charges the same as BT (some @ ½p/minute, some at 1p/minute and so on) but bear in mind Virgin have blocked some - so, again, Sky appear to have that option available too.