In this case I couldn't help noticing our T-Mobile bill design as the 'before' to the new design developed by Boag Associates and Tullo Marshall Warren, illustrated in Borries Schwesinger's The Form Book. While not wanting to take anything away from the new design, I thought it might be worth looking at why designs become obsolete and need revisiting.
A key constraint of this design was that it had to be implemented in the Flexible Bill Formatter application that is integral to the Amdocs billing platform. Amdocs dominates mobile phone billing and although at this time (the project started in 1998, I think) their formatter was very primitive compared with dedicated systems such as Doc 1, we had to use it... and were surprised to find that it could not cope with double column layouts. That's why in our design the customer information block is to the right and below the main billing information – Amdocs could not get it to sit in the white space above.
When T-Mobile acquired One2One they asked us to adapt the bill to the new brand, with the result below left. The new brand guidelines no longer allowed the tinted background that previously had highlighted the total on a white panel. But note that this is different in two key respects from the 'before' that appears in the case study (below right). In our version the customer information is anchored by the vertical line, that in the case study 'before' floats below it. And in our version, there is a prominent contact phone number at the top right, missing in the case study example (and criticised for being missing there).
The lesson from this – information design works in a shifting environment, where products change brands change, and most importantly people change. Memories fade, and designs aren't always maintained.
When we became fully integrated into Enterprise IG, following our own acquisition, we had to stop working for T-Mobile as Vodafone was a major client of the group. This was regrettable, as we had by then been asked to develop radical new designs for the bill, which, it was obvious to everyone, was no longer fit to cope with the new products and tariffs being offered by that time (2004). Here is one of the more exploratory designs we developed, never produced (designer: Richard Bland).