If you are on contract, you may use your usual UK allowances outside the EU with up to 50 GB data per billing month if you have more, when you buy the Zone 1 Pass for £5 / day or £25 / week. Otherwise you will need to pay the charges or buy roaming add-ons as set out in https://ee.co.uk/help/mobile/roaming/roaming-costs/countries/bosniaherzegovina.
If you are on contract, just remember to text ROAMING to 150 before you leave UK to ensure the roaming ability is enabled on your account.
If you are on PAYG, just make sure you had already used your PAYG SIM to make a call or text in the UK.
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To phone EE CS: Dial Freephone +44 800 079 8586 - Option 1 for Mobile Phone & Mobile Broadband or Option 2 for Home Broadband & Home Phone
ISPs: 1999: Freeserve 48K Dial-Up > 2005: Wanadoo 1 Meg BB > 2007: Orange 2 Meg BB > 2008: Orange 8 Meg LLU > 2010: Orange 16 Meg LLU > 2011: Orange 20 Meg WBC > 2014: EE 20 Meg WBC > 2020: EE 40 Meg FTTC > 2022:EE 80 Meg FTTC SoGEA > 2025 EE 150 Meg FTTP
