In my case our network here uses HSPA for voice and LTE for data but VoLTE is optionally available but not required as of yet. Thing is my account has VoLTE specifically enabled so not sure why it’s not working. Some have been saying that older firmware works which seems counter-intuitive to me why would they deprecate VoLTE on newer firmwares?
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What requirements do I need to meet to enjoy 4G calls?
All Orange residential and self-employed contract customers can enjoy 4G calls at no additional cost. You just have to have a smartphone compatible with the service, updated to the latest operating system version.
In order to enjoy 4G calls it is necessary to have a 4G SIM in your terminal. If this is not the case, you can exchange your current SIM for a 4G SIM, for a one-time payment of € 5, in any of our stores.
The service is compatible with most models of the terminals purchased both through Orange and other distributors (Amazon, Media Markt, El Corte Inglés, etc.).
Do I need to request 4G call activation?
No, it is not necessary to activate VoLTE. Compatible smartphones take advantage of these improvements automatically.
Is the VoLTE service compatible with all my services?
The VoLTE service is compatible with all services except:
Enterprise Virtual Private Networks (VPNs)
Eco Card
MultiSIM (only the secondary SIM is incompatible with VoLTE on Android phones)
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Were you (1) roaming with your Telia SIM, or (2) using an Orange SIM that you bought?
My Telia SIM.
VOLTE does not seem to work at Telekom Deutschland.
When I set the network to manual selection and search for the networks, interestingly only Vodafone, o2-de, TDG and a network without a name is found.
Android finds Telekom.de as network, the APNs from the sim card are also different.
Can this have something to do with the problem?