Childlock?

[Lakotaubp]

All coming back to the same thing a service provider option/service. Mine blocks calls to charity telethon donation and premium TV quiz/voting as standard and I know some other do allow that. Try what @advocatux said check out your providers website.

[Flohack]

@thomas_ww Please ask your service provider how to block "Mehrwertnummern"

BR

[guru]

I have an old landline ISDN (Digital subscriber service in Germany) phone at home, still as my only landline phone in use. Even this one from 1996 allows to program blocked numbers as "00" or "0190" (these examples are given in its manual). The block is done locally, i.e. not done in the provider.

[Lakotaubp]

@thomas_ww The android outgoing blockers are individual apps and not built into the system. There are as has been said no such apps in the Openstore at present. Someone may develop one in the future, I would not know how difficult this may or may not be to achieve as I do not have the skills.
Until then it looks like a good screen lock pin/passcode to stop people getting in and double checking with the provider "Mehrwertnummern” as suggested by @Flohack

[Thomas_ww]

My wife calls her mother 8 times a week. This is a call from Germany to Tschechia.
If you touch "Mobil" you pay a price per minute.
If you touch "WhatsApp" your call is for free!

My beloved wife knows this very well, but sometimes she uses the wrong button. 10 times use the wrong button is about 100 Euro.

• My provider definitely will not block calls abroad.
• For Android there are some Outgoing Call Blockers. I tested them all. - None of them worked.

IF Ubuntu would have a feature blocking all outgoing calls abroad as a part of the system, it would be a mighty tool with an unique selling point.

LG Thomas

[Pulsar33]

Hello
The best child lock is your child's own brain. Discuss, listen, answer, explain and your child will not need this. Otherwise he will find any way to bypass your restrictions, including using a friend's phone to whom he will become indebted.
Best regards
Pulsar33

[Thomas_ww]

@pulsar33 Yes, you are basicly right. This kind of "childlock" is a foolproof. It will block everything that costs extra money

[Flohack]

@guru If you solve it on the App level it can be unblocked again by children e.g. There is no reliable way to block it than on the provider level. Whoever has access to the device will find a way to unblock it, if he or she really wants

[dobey]

@flohack Even provider level blocking is not necessarily reliable, as it's probably exposed as a carrier option, which can be modified through phone app settings, like call forwarding and such.

But I don't think the goal is to hard block here. It's to prevent such accidental things. If one has enough will to get around such blocks, they can very easily regardless of where the block is.

[Thomas_ww]

@dobey FritzBox! has this feature as a part of the system. This is one of the features, that make the FritzBox popular.