Phone numbers
Number Porting: move your existing number to Silux Call
Keep the number you already have. Fill in the porting request, sign the letter of authority online, attach a recent bill and track progress here.
Which plans include it
Free on every paid plan (Entry and above). Not available on the Free Trial.
What it means
"Porting" means moving a phone number from your current provider to us so you keep the same number. Nothing changes for your callers — the same number simply starts ringing on Silux Call.
What it does
- Collects everything your current provider needs to release the number.
- Builds and lets you sign the Letter of Authority (LOA) online — no printing or scanning.
- Accepts a single number or a range of up to 100 consecutive numbers.
- Records the emergency (999) address for the number.
- Shows each request's status from submission to completion, and emails you updates.
Every part of the page
- How number porting works
- The key rules: your number keeps working with your current provider until the port completes; you need your account number exactly as it is on your bill; a recent bill is required.
- Request Port / New porting request
- The full form. Use "save a draft" to finish later. Hover any question mark for an explanation of that field.
- Numbers to port
- One number per line, exactly as your current provider bills them. "Add a range" fills in a block of consecutive numbers (first and last, max 100).
- Current provider / Account number / Range holder
- Who bills you today (as written on your bill), your account number with them, and — optional — the network that owns the number block. Leave Range holder blank if unsure.
- Installation address
- Where the line is physically installed, copied exactly from a recent bill. It is matched field by field — the street name is the most common cause of rejection.
- 999 address
- The address emergency services are given if someone dials 999 from these numbers. Usually "Same as the installation address above".
- Your details / Contact name
- Who the numbers belong to and who we should talk to. This name goes on the LOA.
- Letter of authority (LOA)
- "Sign the LOA online (recommended)" builds it from your answers — draw your signature with a finger or mouse. Or "Upload your own signed LOA".
- Recent bill
- Required. A bill from the last 3 months showing the numbers and installation address (PDF, JPG or PNG).
- Requests table
- Number, Type, Provider, Requested date, Status and Submitted date for every request. You can cancel a request that has not completed.
How to use it
Port a number
- Do NOT cancel your current service — cancelling releases the number and the port fails.
- Open Number Porting and press "Request Port".
- Enter the number(s) exactly as on your bill.
- Enter your current provider and account number.
- Copy the installation address from a recent bill, character for character.
- Confirm the 999 address.
- Sign the LOA online and upload a recent bill.
- Tick the terms and submit. You get an email with your reference.
- Once the port completes, cancel with your old provider.
Port a block of numbers
- In "Add a range", enter the first and last number (same length, only the last 4 digits may differ, max 100).
- Press "Insert range" — every number in between is added.
- Complete the rest of the form as normal.
Examples
Moving from BT
Fill in the request with your number 01632 960000, sign the letter of authority (LOA) online, attach a recent BT bill. Your number keeps working on BT until the switch day, then rings on Silux Call.
Keep the old line working until the move
Do not cancel your old provider before the port completes. Cancelling first can lose the number for good.
Recommended settings
- ★Copy the address from your bill, never from memory — mismatches are the number one cause of rejection.
- ★Use the online LOA; it is filled in from your answers so it always matches.
- ★Set up your routing (Call Routing, Greeting Menu) before the port date so calls work the moment it switches.
- ★Keep your old service and bill paid until we confirm completion.
Abbreviations on this page
- Porting — Number porting
- Moving an existing phone number from one provider to another so you keep the same number.
- Example: Moving your 0113 number from your old provider to Silux Call, keeping the same number.
- LOA — Letter of Authority
- A signed letter from the account holder agreeing to move their numbers to us. Your current provider will not release numbers without it.
- Example: You sign the LOA online when you ask to bring your number over from BT.
- CP — Communications Provider
- Any phone or broadband company. "Losing CP" is the provider you are leaving; "gaining CP" is us.
- Example: Your old phone company is the losing CP; Silux Call is the gaining CP.
- Range holder
- The network operator that owns the block your number comes from — often not the company that bills you. You never need to know it; we can look it up.
- Example: Your bill may come from one company while the number block belongs to another network; that network is the range holder.
- 01 / 02 — Geographic numbers
- UK landline numbers tied to a town or city by their area code, such as 0161 for Manchester or 020 for London.
- Example: 0113 (Leeds) and 020 (London) are geographic numbers.
- 03 / 08 — Non-geographic numbers
- UK numbers not tied to a place. 03 costs callers the same as a landline call; 08 numbers can carry extra charges.
- Example: 0800 and 03 numbers are non-geographic; they are not tied to a place.
- 999 / 112 — UK emergency numbers
- Both reach the emergency services in the UK. Over VoIP the operator is given the address you register, not your live location.
- Example: Dial 999 or 112 from your Silux Call line and it reaches the emergency services; register your address so they know where to come.
- Ofcom — Office of Communications
- The UK telecoms regulator. Its rules cover 999 access, number porting and caller ID.
- Example: Ofcom sets the UK rules on number porting and emergency calls.
Questions
How long does porting take?+
Typically about 14 working days from a correct submission. It depends on your current provider releasing the number, and any mismatch in the details can add time.
Does porting cost anything?+
Porting is free on every paid plan (Entry and above). It is not available on the Free Trial.
Will my number stop working while it moves?+
No. It keeps working with your current provider until the switch, which usually happens with only a brief interruption.
Why was my port rejected?+
Almost always because a detail did not match your provider's record — usually the installation address, postcode or account number. Check your latest bill and resubmit.
Can I port a mobile (07) number?+
The form accepts geographic (01/02), mobile (07) and non-geographic (03/08) numbers. Contact support before porting a mobile number so we can confirm it can be supported.
Do I have to cancel my old provider?+
Not until we confirm the port is complete. Cancelling first releases the number and the port fails.
Related help
Already a customer? Open this page in your dashboard: Number Porting. New to Silux Call? See the plans or start a free trial.