In Germany telcos using 700MHz for 5G a lot (also for LTE in non-5G regions and sometimes with DSS). So they can create a lot of coverage on rural areas or building penetration.

Telefonica didn't set their signallevel-to-bars-parameters on their SIMs correctly yet. Even directly next to a antenna you only see 1-2 bar although the signal level is maxing out.

700MHz is a mixed bag for rural coverage. Great for punching through trees, but need very tall towers to overcome destructive fresnel lens losses. Higher frequencies are usually better here + more gain!