How to Move Phone Numbers Across Accounts (US and International)

By Sparkforge Support Team ·Last reviewed May 3, 2026

Moving numbers between Sparkforge Phone and Twilio (or across agencies) follows a two-step process: collect the right Twilio Account SID (or Regulatory Bundle SID for international) plus the destination sub-account ID, then open a Sparkforge Support ticket. Sparkforge coordinates the migration end-to-end.

Sparkforge Phone, Twilio, and cross-agency moves now share one process. You no longer open a separate Twilio ticket. Sparkforge Support coordinates the migration from start to finish.

The three move types

Sparkforge Phone → Twilio: Provide the gaining Twilio Account SID (the destination Twilio account).
Twilio → Sparkforge Phone: Provide the losing Twilio Account SID (the current Twilio account).
Sparkforge → Sparkforge across different agencies: No Twilio credentials required.

Before you start

For US numbers

Twilio Account SID (gaining for outbound to Twilio, losing for inbound from Twilio).
Destination sub-account ID (where the number will live).
Phone numbers in E.164 format, e.g. +1XXXXXXXXXX.

For international numbers

Regulatory Bundle SID (instead of Account SID).
Address SID.
Destination sub-account ID, if applicable.
Phone numbers with country code.

Step 1: Gather Twilio credentials

Find these in the Twilio Console under Account Info:

Sparkforge → Twilio: Gaining Twilio Account SID.
Twilio → Sparkforge: Losing Twilio Account SID.
Sparkforge → Sparkforge across agencies: Skip this step.

Step 2: Get the destination sub-account ID

In your Sparkforge account, go to Settings > Business Profile. Note the Sub-account ID (also called Location ID) of the sub-account that holds or will hold the number.

Step 3: Open a Sparkforge Support ticket

Include in the ticket:

The phone number(s) being moved.
The relevant gaining or losing Twilio Account SID (or Regulatory Bundle SID + Address SID for international).
The destination sub-account ID.
Your preferred cutover window.

Sparkforge Support schedules and coordinates the entire migration, then confirms when the number is live.

International numbers: pre-checks

Regulatory bundle is approved and current.
Documents are valid.
Country-specific sender ID or registration is in place for the destination (e.g., Alphanumeric Sender ID, local onboarding, emergency address).

Frequently Asked Questions

How long does a migration take?

One to two business days from the time Sparkforge Support has all required IDs (gaining or losing Twilio Account SID, destination sub-account ID) and the number list. Sparkforge confirms the cutover window and notifies you when the number is live.

Can I move multiple numbers at once?

Yes. Submit a single CSV or inline list in the ticket. Validate each number after cutover.

Do A2P or Toll-Free approvals transfer automatically?

Not always. After the move, confirm numbers are attached to the correct brand or campaign, or to your Toll-Free verification.

Do past recordings and voicemails migrate with the number?

No. Future recordings follow the number after cutover. Download any historical assets you need to retain before the move.

What if I need to roll back?

Reply to the ticket immediately during the cutover window. Whether rollback is possible depends on the carrier and timing.