I have credit but I am getting an error when attempting to make a call saying I do not have sufficient credit. Why is this?

Your Lycamobile SIM is set up to let you know when your balance gets below a set level. That is why you may receive this error message. However once you disconnect the first attempt and try again, the call will go through – as long as there is enough credit. If the problem persists, please call Customer Services on 322 from any Lycamobile number.