1. Top-up (UK SIMs)
    2. Top-up (US SIMs)
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IMPORTANT NOTICE: This is not an automated service therefore the top-up does not happen in "real time". The top-up will be carried out and confirmed by email within 2 working days of your request. REQUESTS RECEIVED AFTER 4pm GMT FRIDAY WILL BE DEALT WITH ON MONDAY and completed by midnight Tuesday.
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Top-up Three Mobile (UK)

From: £10.00

Top-up Amount (Three UK)

Top up details

Posted in .

A £4 handling fee will be added to the value of the transaction

Top up details

Your contact details

I accept the terms and conditions (Network) & terms and conditions (GSM International)


In the event that you are not redirected to PayPal please try using a different browser (Internet Explorer, Firefox, Chrome) and ensure Javascript is enabled. If you still experience problems please email support@gsminternational.co.uk with your UK departure date, phone number, the serial number (ICCID) of the SIM card you want to top-up, and the top-up amount required. We will walk you through an alternative procedure.

Three TRIO front

With your THREE UK sim card you can:

  • Call and text your friends travelling with you and your group leader as well as all UK numbers and send sms messages (activation and minimum top up required);
  • Surf the internet as much as you like for a whole month with just £15 topup (minimum £15 top-up and All In One 15 plan required, see quick guide)
  • Call home for FREE (depending on country called) see www.call07755.com for instructions

DUE TO THE HIGH VOLUME OF ACTIVATIONS PLEASE ALLOW UP TO 2 WORKING DAYS FOR YOUR REQUEST TO BE CONFIRMED BY EMAIL. REQUESTS RECEIVED AFTER 4PM ON FRIDAY WILL BE PROCESSED ON MONDAY MORNING