I recently migrated my daughter's bill-pay mobile account for her Samsung phone, from Gomo to Lidl's new Lidl Connect MVNO offering. Things went OK, except for one thing: her mobile data didn't work at all. The reason was that the APN settings had not been provisioned when I installed the new SIM card and enabled the network.
By comparing against my Pixel 10 phone, which had working settings, it looks like this is what's needed:
Go into Settings -> Network and Internet -> SIMs -> then select the Lidl Connect SIM. Scroll down to Access point names. In her case she had no APNs set up at all. I added the following 3 entries:
APN name: 1GLOBAL DATA
APN: truphone.com
APN type: default, mms, supl, dun
MMSC: http://mmsc.truphone.com:1981/mm1
[all other fields left at defaults]
APN name: 1GLOBAL HOS
APN: hos
APN type: xcap
APN protocol: IPv4/IPv6
APN roaming protocol: IPv4/IPv6
Network type: LTE, NR
[all other fields left at defaults]
APN name: 1GLOBAL IMS
APN: ims
APN type: ims
APN protocol: IPv4/IPv6
APN roaming protocol: IPv4/IPv6
Network type: LTE, NR
[all other fields left at defaults]
These match what I have on my phone; I'm not sure if they are exactly correct, but her mobile data is now working (as is mine). Hope that helps someone.