Before you switch

Is your phone unlocked?

A locked phone only works on the carrier that sold it. Before you switch to Halo, here are four ways to check, plus what to do if it is locked.

schedule4 min readUpdated May 15, 2026By the Halo team
Method
Settings menu
Method
IMEI lookup
Method
Carrier app
Method
Dial *#06#

01Check on iPhone

  1. Open Settings.
  2. Tap General, then About.
  3. Scroll down to Carrier Lock (some iPhones say Network Provider Lock).

If it says No SIM restrictions, your iPhone is unlocked.

02Check on Android and Samsung

Menus vary slightly by brand and model. The general path:

  1. Open Settings.
  2. Tap Connections (or Network & Internet).
  3. Tap Mobile network, then SIM status or Network operators.

Some Android phones explicitly show SIM network unlock or Network locked. If you do not see a lock indicator and you can switch network operators manually, that is a good sign.

03Check your IMEI online

Most carriers offer an IMEI unlock-check tool on their website. Third-party services can also report whether an IMEI is unlocked, blacklisted, or tied to a specific model.

To find your IMEI, dial *#06# on your phone, or open Settings > About phone > IMEI.

04Ask your current carrier

Contact your current carrier and ask: “Is my device unlocked or eligible to be unlocked?” They will confirm the lock status and list eligibility requirements, which usually include:

  • Device fully paid off
  • Active for a minimum number of days
  • Account in good standing
  • No fraud or blacklist flags

If your phone is locked

You can usually get it unlocked in a few steps:

  • Request the unlock. Contact your carrier's support, use their website, or visit a store. They will either unlock it remotely or give you an unlock code (older phones).
  • Processing time. Usually same-day to a few days, depending on the carrier.

Eligibility rules vary by carrier, so check your carrier's policy first. Devices reported as lost or stolen are typically not eligible.

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Tip
Tip: request the unlock before starting your transfer. Once the port completes, your old account closes, and some carriers will not unlock a closed account's device.

A few other things to know

  • eSIMs. Unlocking still matters for using a different carrier's eSIM. Some carriers require you to request an eSIM transfer after the unlock.
  • International and roaming compatibility. Unlocked does not always mean fully compatible. Check the LTE and 5G bands on your phone against the new carrier's bands if top speeds or specific networks matter to you.
  • Blacklisted devices. If the IMEI is on a blacklist (reported lost or stolen), carriers will refuse service even if the phone is technically unlocked.

FAQCommon questions

A locked phone only accepts SIM cards from the carrier that sold it. If you try to install a Halo eSIM on a locked phone, it will either refuse the install or it will install but show "No service." You need an unlocked phone to switch carriers.
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