Dear all,
as it looks like, United Mobile as a company came to an end. If you follow the enclosed link, there is a letter published that tells, United Mobile will file bankruptcy. The article further claims, anyone should keep the SIM card as it is still possible, that the +423 number range will be activated somewhen soon.
BK
Amtlich: United Mobile Konkurs / United Mobile bankruptcy 2lounge
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Mobiles: iPhone 7+, iPhone 7, iPhone SE, Blackberry Priv, Honor 8, Lumia 950
Prepaid-SIM: 3 UK, Save Money Sim, Toggle Mobile UK, XX-Sim, Koko Mobile