This might be an error in their page and it should say "01, 02, 03 numbers" under landlines - but someone here said that actually they charge much higher for 03.
Personally, I do not like the fact that Voipify 03 numbers are not treated exactly the same as their very low cost 01/02 numbers. - That said; Voipify 03 calls do cost arround the same as other voip providers charge for all landline numbers including 01 and 02 numbers.
Also, Voipify mobile and international call costs tend to be lower than other providers.
Also, it looks like they charge an extra £3.60 per month for every device registered. That would rule them out for me.
It was confusing to me when I first considered joining them so I phoned them to ask how much it would cost me and as I understand it one location costs £3.00 plus VAT per month and each phone number, at that location, costs £1.00 plus VAT per month so one location with one phone number costs £4.00 plus VAT per month and each additional phone number at the same location costs another £1.00 plus VAT per month.
In our case: We have six dect phones, (devices), connected to an N300a and one Voipify line/number is connected to the N330a and this costs us a total of £4.00 plus VAT, per month and includes 200 minutes of 01/02 calls.
For each additional Voipify Phone Number it costs £1.00 per month plus VAT
At present Voipify does suit me as the performance is good and the cost is reasonable but if that changed and/or other providers were much better/cheaper I would change and a comparison between Voip providers is always helpful.