| O2 is slightly different from the other providers. It requires users to pick a bank account depending on the length of their numerical customer reference number. | |||
| Utility provider | Sort Code | Bank Account | Reference |
| O2 | 40-27-15 | 41461850 | your 7-digit reference number |
| O2 | 40-02-50 | 11245163 | your 10-digit reference number |
| O2 | 01-10-01 | 41341813 | your 11-digit reference number |
| O2 | 40-02-50 | 11245163 | your 16-digit reference number |
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