Just noticed this post  on MSE,by Utilitybroker.
http://forums.moneysavingexpert.com/showthread.html?t=252993

"I see that 18185 have changed their prices to 0845/0870 numbers and introduced 6am to 6pm and 6pm to 6am time bands for them.

0845 (Old) P.3p.E.1p. W.1p. (New) 6am to 6pm.3p. 6pm to 6am.0.5p.Weekends 0.5p. (So a price reduction at Offpeak and Weekends makes them the cheapest at moment at these times of the week).

0870 (Old) P.4p. E.4p.W.2p. (New) 6am to 6pm.5p 6pm to 6am 3p.Weekends 1p.(A price increase of 1p at peak rate.But a price reduction at Offpeak and Evenings,makes them cheapest at these times of the week)."

No dispespect orsonkart but I found your post a little difficult to read.  How about the below?

From 1st October 2006, the comparisons (for BT Together customers) will be:

0845

Weekdays  
BT - 3p connection + 3p/min (was 3p/min & subject to 5½p minimum call charge)
18185 – 4p connection + 3p/min

Evenings
BT – 3p connection + 1p/min (was 1p/min & subject to 5½p minimum call charge)
18185 – 4p connection + ½p/min

Weekends  
BT – 3p connection + ½p/min (was 1p/min & subject to 5½p minimum call charge)
18185 – 4p connection + ½p/min


0870

Weekdays
BT - 3p connection + 7.11p/min (was 7.51p/min & subject to 5½p minimum call charge)
18185 – 4p connection + 5p/min

Evenings  
BT – 3p connection + 3.69p/min (was 3.75p/min & subject to 5½p minimum call charge)
18185 – 4p connection + 3p/min

Weekends  
BT – 3p connection + 1½p/min (was 1½p/min & subject to 5½p minimum call charge)
18185 – 4p connection + 1p/min

I think I'll be using 18185 for all 0845 and 0870 calls (blow the occasional 1p extra connection charge).

Further to the above, I omitted the 4 exceptions to 0870 prices (for 087009, 0870185, 0870187 and 0870188 numbers).

BT currently charge 4.95p/minute Weekdays, 2.49p/minute Evenings and 2p/minute Weekends but I have been unable to find BT's post-1/10/06 prices.

Surprisingly 18185 have not increased the charge of a weekday 0870 call using their 08081 703703 number - this is still shown as being 4p a minute - but don't hold your breath.

4PetesSake wrote on Sep 11^th, 2006 at 9:43am:

Surprisingly 18185 have not increased the charge of a weekday 0870 call using their 08081 703703 number - this is still shown as being 4p a minute - but don't hold your breath.

Good Spot.  :)

Ouch 5p a minute to call 0870 minimum now + 4p connection.  Still can hardly blame them as I can't believe they were making any money at the old 4p per minute price since some companies running 0870 numbers actually receive 4p per minute.  I think under the old pricing model they must have assumed people would also use them for 0870 in evening or weekend when they would have made more money - which of course almost nobody did as their new time banded charges show.

Looks like I'm going to work even harder to never call 0870 now.   Will always have to write an email instead and then email the CEO if customer service don't reply.