# How to Minimise Downtime When Changing Fibre ISPs

Source: https://urbanx.co.za/knowledge-hub/switching-moving-managing-fibre-service/minimise-downtime-switching-fibre-isps

**Answer:** Confirm the FNO and line details, check the old cancellation terms, ask both ISPs for written service and billing dates, keep the old service active until the migration is accepted, prepare the new router before cutover and keep temporary mobile connectivity available. No provider can guarantee zero downtime across every FNO workflow.

Part of [Switching, Moving & Managing a Fibre Service](https://urbanx.co.za/knowledge-hub/switching-moving-managing-fibre-service) · 9 min read · by UrbanX Knowledge Hub

**Last reviewed: 26 August 2026 · 9 min read**

### Downtime has administrative causes too

When the same physical FNO line is used, no trenching or new fibre should normally be necessary. The gap is often created by timing:

- the old service ends before the line is released;
- the new order is submitted before cancellation is recognised;
- the address or line identifier does not match;
- a disputed transfer requires proof of occupation;
- the new router is unavailable or not configured;
- the migration is scheduled outside support hours;
- a weekend or public holiday delays manual intervention.

This is not the same as an optical line fault. If the service had LOS or PON problems before the switch, use the [FNO Troubleshooting pillar](/knowledge-hub/fno-troubleshooting) rather than expecting a migration to repair the line.

### Build a four-date plan

Write down these dates before committing:

| Date | Controlled by | What it means |
| --- | --- | --- |
| Cancellation notice received | Old ISP | The contractual process has started |
| Old service end | Old ISP and agreement | Access and billing are scheduled to stop |
| FNO line release | Old ISP/FNO workflow | The line becomes available to the gaining ISP |
| New service activation | New ISP/FNO workflow | The new ISP can provide internet access |

Ask whether any date is only estimated. A confirmed notice receipt is not the same as a confirmed release.

### Start early enough to resolve mismatches

Several weeks before the preferred switch:

1. Confirm the exact FNO and address record.
2. Check the current agreement, notice and final billing rules.
3. Ask the new ISP whether it accepts advance migration orders.
4. Record the ONT, line or circuit identifier.
5. Confirm whether the current router must be returned.
6. Ask whether the new router can be delivered before cutover.
7. Update email and mobile contact details with both providers.

Do not wait for the final service day to discover that the unit number or account holder is wrong.

### Avoid the two opposite timing mistakes

#### Cancelling too early

If the old ISP disconnects before the new migration is accepted, the household can wait without service while the FNO updates the line state. This may be unavoidable in some processes, but it should not happen by accident.

#### Activating too early

Keeping both services billable for a short period may protect continuity, but it can also create an invoice overlap. Decide which risk matters more and document the dates. Read [Why Billing Can Overlap When You Switch Fibre Providers](/knowledge-hub/switching-moving-managing-fibre-service/billing-overlap-switching-fibre-providers).

### Prepare the equipment layer

The ONT should normally remain powered and untouched. Photograph its labels for private reference and do not factory-reset it.

For the router:

- confirm whether the old router stays or must be returned;
- arrange delivery or purchase of the replacement;
- save the new ISP’s connection instructions;
- confirm whether the ISP provisions the router remotely;
- retain the required Ethernet cable and power supply;
- do not dismantle the home network before the switch.

Router placement and Wi-Fi optimisation are separate topics owned by the [Home Network Infrastructure pillar](/knowledge-hub/home-network-infrastructure-wifi-gaming).

### Choose a cutover window deliberately

Where the provider offers a choice, prefer a window when:

- an authorised account holder is available;
- both ISP support channels are open;
- the household can tolerate a short interruption;
- work deadlines, examinations and live events are not in progress;
- the new router and backup connectivity are ready.

Do not rely on an overnight switch if no one can assist the next morning.

### Keep a migration evidence pack

Save:

- old cancellation notice and acknowledgement;
- old service-end and release dates;
- new order and migration reference;
- exact address and FNO;
- ONT or line identifier;
- router delivery and return records;
- support contacts and operating hours;
- screenshots of status updates;
- first and final invoices.

If the migration stalls, send the same concise pack to the new ISP. The new ISP can then escalate the line state with the FNO without repeatedly asking for basic facts.

### Temporary connectivity is a continuity tool

A mobile hotspot, prepaid SIM or other temporary connection cannot force a fibre release, but it can protect essential activity. Test it before the cutover and understand its data limits, power needs and indoor signal.

Do not redesign this article into a backup-power or bandwidth guide. The purpose is simply to prevent an administrative delay from becoming an emergency.

### What to do if the cutover stalls

1. Confirm whether the old service still works.
2. Ask the old ISP whether the FNO cancellation is submitted and effective.
3. Ask the new ISP whether the line is visible, released, disputed or activated.
4. Confirm the address and line identifier on both records.
5. Provide proof of occupation if a previous customer is still linked.
6. Get a complaint reference if the stated date is missed.
7. Keep paying undisputed contractual amounts while the complaint is handled.

Technical diagnostics belong in [Support & Diagnostics](/knowledge-hub/support-diagnostics) only if the new service is confirmed active and the problem is then a connection fault.

### Sources

- [ISPA FNO and ISP Best Practice Recommendations](https://ispa.org.za/about/working-groups/best-practice-recommendations/)
- [ISPA Fibre Primer](https://ispa.org.za/policy-and-advocacy/fnos-and-isps/ispa-fibre-primer/)
- [Octotel migrations and reconnects guidance](https://octotel.co.za/contact/)
- [Openserve Fibre FAQs](https://openserve.co.za/faq)

### Related guides

- [All Switching, Moving & Managing a Fibre Service guides](/knowledge-hub/switching-moving-managing-fibre-service)
- [How to Switch Fibre ISPs on the Same FNO](/knowledge-hub/switching-moving-managing-fibre-service/switch-fibre-isps-same-fno)
- [What Is a Fibre Line Release?](/knowledge-hub/switching-moving-managing-fibre-service/fibre-line-release-explained)
- [Why Billing Can Overlap When You Switch](/knowledge-hub/switching-moving-managing-fibre-service/billing-overlap-switching-fibre-providers)

## Frequently Asked Questions

**Can switching be completely seamless?**

It can be very short on some networks, but no universal zero-downtime promise is responsible. Administrative checks and router readiness still matter.

**Should I cancel only after the new ISP activates?**

That may not be possible because the same line often must be released first. Ask both ISPs for the supported order sequence.

**Should I switch on a Friday?**

Only if the relevant migration and support teams will be available afterward. Choose a time based on actual operating coverage, not the weekday alone.

**Does keeping the ONT powered help?**

It avoids creating a separate equipment problem, but it does not control the administrative release. Follow the FNO or ISP’s instructions.

**Is overlapping billing always an error?**

No. It may reflect the old notice period and an earlier new activation chosen to protect continuity. Compare invoice service periods with the confirmed dates.