If at all one seeks a Mobile service provider, I feel Orange beats the competitors hands down. I have used BPL as well, however I felt the roaming & signals in fortified areas were weak. However I am none too sure about how well BPL have upgraded their services as of date.
Orange has the technological backing of Hutch a trusted name worldwide. The tariffs are economical with a good menu to choose from!Billing is not a problem with Orange ( it should not be a problem with other service providers as well...all being computerised ).
To sum up my experience with Orange, just a couple of words..no problems