What logo the phone displays on the screen, to a large extent, is to do with the phone as much as the network. Basically a part of the phone's software can be set to show a name on the screen as controlled by the SIM, or not. If this setting is enabled, the name can be changed remotely by updating the SIM Card. If not, SIM Updates (as Orange call them) will have no effect whatsoever unless CPHS (part of the phone's software that I just mentioned) is enabled,
As for the new One2One tariffs (sorry, but I refuse to go along with the new name since the underlying network and product has not changed one bit), the Orange stance on promotional tariffs has changed a LOT recently. Rem,ember the Everyone 100 tariff was, strictly speaking, promotional - yet it's available on OVP. In recent months, common sense has increasingly begun to prevail over bureacracy at O, and OVP should replicate all the new BTC & 121 tariffs in the next week or so. They need to sort out major technical problems with their billing platform first, but once that's done...