Public Mobile Referral Guides for activation
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Public Mobile SIM card guide (2026) + referral code 5ESROG
SIM sizes, where to buy, how to activate, and quick fixes if your SIM is not working.
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Public Mobile SIM Card Guide (Buy + Activate) 2026

This guide covers Public Mobile SIM cards, activation steps, and troubleshooting. If you searched for a “promo code” or “coupon”, what you usually need is the referral field during activation.

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SIM sizes (quick)

  • Nano SIM is the most common size for modern phones.
  • Many SIM packs are “3-in-1” — pop out the size that fits your device.

Activation steps

  1. Power off your phone and insert the SIM.
  2. Turn the phone on, then connect to Wi-Fi if prompted.
  3. Open the code-applied signup link and choose a plan.
  4. When asked, confirm the referral code is 5ESROG.
  5. Restart once more if signal/data does not connect immediately.

SIM not working? Try this

  • Restart the phone and reseat the SIM.
  • Confirm the SIM is fully seated in the tray.
  • Test the SIM in another unlocked device (if possible).
  • Check cellular settings and ensure the line is enabled.

Where to get a Public Mobile SIM

Option 1: Order online

Ordering through the official flow is usually the most direct. Availability, shipping time, and pricing can vary by offer.

Option 2: Buy in-store (if available)

Some retailers may carry SIM packs. Confirm local availability before making the trip.

FAQ: Public Mobile SIM card

Do I need a SIM card to activate Public Mobile?

If your phone does not support eSIM, yes. If your device supports eSIM, you may be able to activate without a physical SIM.

Where do I enter the referral code?

During activation, enter 5ESROG in the referral code field.

What SIM size do I need?

Most newer phones use a nano SIM. Many SIM packs include multiple sizes.

Can I keep my number when switching?

Usually yes via number transfer (porting). Keep your old service active until the transfer completes.

Why does my phone say “No SIM”?

Reseat the SIM, restart, and confirm the device is unlocked. If possible, test the SIM in another device to isolate the issue.

Note: SIM availability and activation flow can change. Confirm the current steps during signup.