When try to dial an 00800 number on my mobile, the call appears to connect, but I can't hear anything. Calls to other numbers work fine and I can use the same 00800 number fine on my (BT) landline. It's important because the particular 00800 number is an international number for roadside assistance, so would be stuck if my car broke down.
Welcome to our community and thanks for your post - 00800 numbers are free from most landlines; however, this number is classed as a chargeable international number when calling from a mobile. This is the case with most mobile companies.
As our user @enlli - please do check your online account to see if you have a spending cap or any restrictions on your account to stop you calling a number outside of your allowances.
Sorry to hear that this is happening to you @despe.
I have been able to look into your account and cannot see anything that would be causing you you to have the issues with international dialling problems. As you said you have no spending cap on your account and and you have no barring set on your handset.
I have turned international barring on and off again, I hope that this can reset the connection, please can you give this a try and let me know if that helps at all.
Please could you try the number again, we have turned calling barring on and taken it off again in hope that this resets the connections, everything looks ok, if you could try to call the number again and let me know if you have the same issues.