Whilst the following timescales are based on industry agreed service level agreements, these agreements are not backed by any regulation - therefore port orders can often exceed these timescales due to third party delays that are outside of Ziron's control.
All timescales are in working days and start from the point an order is acknowledged by Ziron as submitted, excluding any pre-notified shutdown of Ziron and industry partner's porting desks (e.g. over Christmas and New Year). Working days are Monday to Saturday for UK GNP single line ports, and Monday to Friday for all other port types.
UK geographic number portability (GNP)
Regular ports
| Installation Type | Response Time (days) | Lead Time (days) |
| Single Line | 1 | 4 |
| Multi Line (30 lines / channels or less) but no DDIs | 2 | 7 |
| Multi Line (31-150 lines / channels / numbers) and/or DDI ranges are included | 2 | 10 |
| Multi Line (151 lines / channels / numbers or greater) | 2 | 17 |
| Complex DDI | 2 | 22 |
Subsequent ports
| Installation Type | Response Time (days) | Lead Time (days) |
| Single Line | 1 | 7 |
| Multi Line (30 lines / channels or less) but no DDIs | 2 | 10 |
| Multi Line (31-150 lines / channels) and/or DDI ranges are included | 2 | 13 |
| Multi Line (151 lines / channels or greater) | 2 | 20 |
| Complex DDI | 2 | 25 |
UK mobile number portability (MNP)
All ports
| Port Type | Response Time (days) | Lead Time (days) |
| Consumer (1-25 numbers) | 1 | 1 |
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