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O2 recharge
from anywhere.

Top up any O2 United Kingdom number from abroad. Enter the number, pick a plan, pay by card. Credit lands in minutes.

How to recharge O2 from abroad

  1. 1Enter the number. Type the O2 United Kingdom mobile number with the country code (+44). The operator is detected automatically; no account or app needed.
  2. 2Pick a plan. Choose airtime or a data or validity plan. What the number receives and the validity are shown before you pay.
  3. 3Pay by card. Pay from abroad with Visa, Mastercard, Apple Pay or Google Pay. Your bank may ask you to confirm in its app; that takes a few seconds.
  4. 4Delivered in minutes. The recharge lands on the O2 number within about a minute and you get a receipt by email. If the operator rejects it, you are refunded in full.

O2 plans and prices

Enter a O2 number above to see the live plans for that line.

Useful O2 codes and rules

Keeping the number active
O2's Pay As You Go terms (clause 7.1) say that without at least one chargeable activity in any 6 month period the phone is disconnected, remaining credit is lost and a reconnection comes with a new number. Source: o2.co.uk

Checked against O2's official site on 7 November 2026.

Questions, answered

How long can an O2 Pay As You Go number go unused?

O2's Pay As You Go terms (clause 7.1) say that without at least one chargeable activity in any 6 month period the phone is disconnected, remaining credit is lost and a reconnection comes with a new number.

How do I enter an UK mobile number?

Enter it with the country code +44. A number written locally as 07400 123456 becomes +44 7400 123456, so drop the leading 0 after the country code. UK mobile numbers have 10 digits after the country code. The example is a format guide, not a real number.

How do I recharge an O2 number from abroad?

Enter the number with the country code, pick a plan and pay by card. The operator is detected automatically and the credit goes straight to the phone. You do not need an account or a bank account in United Kingdom.

How much does an O2 recharge cost?

Plans currently start from $9.34 and go up to $88.10, including our service fee. The exact price is shown before you pay, with no extra charges at checkout.

Can I recharge someone else's O2 number?

Yes. Slashtel tops up any prepaid O2 number in United Kingdom, your own or a family member's. You only need the number; the person does not need an account.

What if I enter the wrong number?

Recharges are delivered instantly and cannot be reversed once they reach a valid number, so check the number before you pay. If the operator rejects the number, Slashtel resends or refunds you in full.

What currency do I pay in?

Prices on this page are in US dollars and include the Slashtel service fee. At checkout your card may be shown and charged in your local currency, and the exact amount is confirmed before you pay.

Is it safe to pay on Slashtel?

Yes. Payments are processed by Stripe with 3D Secure where your bank supports it, and Slashtel never sees or stores your full card details.

How long does the recharge take?

Most recharges arrive within a few minutes. If the phone is switched off, the credit lands when it next connects. You get a confirmation email with your order reference.

What happens if the recharge fails?

If the operator rejects the recharge, we resend it. If it still can't be delivered, write to esim@slashtel.com or message us on WhatsApp with your order reference and we'll sort it out.

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