There are various reasons that your attempt to call a UK landline didn't work. For example, some phone plans in the UK charge the caller and recipient of calls so the person you are trying to contact may have declined your call. Other reasons that you may be having trouble may be because of the following issues: The international dialling prefix you have used for your location is incorrect You haven't omitted the trunk code (the first zero in local numbers) The recipient of the call has a phone plan that doesn't accept international calls If you are still experiencing problems and can't make the call, there are alternative options to try. You may be able to make an internet-enabled call through apps like WhatsApp, Skype or Zoom. Many apps also allow video calling, meaning the call will be visual too. To use internet-enabled calls, you and the person you call must have access to Wi-Fi or mobile data. You might find that the signal is glitchy or the call ends if there isn't a good enough connection.