The PinePhone and PinePhone Pro hardware is specifically designed to use chips with good mainline Linux support. Same for the modem with some additional legal constraints.
The ARM and smartphone hardware space is an incredible mess (largely due to anti-competitive behaviour of Qualcomm), so even the best effort of Pine64 to do exactly what you demand is less then ideal.
Community about running GNU/Linux on phones. Projects like Ubuntu Touch, Plasma Mobile, PostmarketOS, Mobian etc. Either on former Android phones or hardware like the PinePhone.
The PinePhone and PinePhone Pro hardware is specifically designed to use chips with good mainline Linux support. Same for the modem with some additional legal constraints.
The ARM and smartphone hardware space is an incredible mess (largely due to anti-competitive behaviour of Qualcomm), so even the best effort of Pine64 to do exactly what you demand is less then ideal.