# Force LTE-only mode (9 = LTE-only, 10 = LTE/TD-SCDMA, 11 = LTE/WCDMA) ro.telephony.default_network=9 persist.dbg.ims_volte_enable=1 persist.dbg.volte_avail_ovr=1 persist.radio.calls.on.ims=1 persist.radio.jbims=1 persist.radio.VT_ENABLE=1 persist.radio.VT_HYBRID_ENABLE=1 Improve LTE scanning and camping ro.ril.enable.amr.wideband=1 ro.ril.enable.dtm=1 ro.ril.enable.enhanced.pdp=1 persist.radio.enable_enhance=1 Signal strength tuning (Qualcomm specific) persist.radio.signal_strength=1 persist.radio.snapshot_timer=22 4. Supported Chipsets & Limitations | Chipset | Effectiveness | Notes | |---------|---------------|-------| | Qualcomm Snapdragon (most common) | High | Full support for RIL tweaks, NV band unlocking possible via QPST + module | | MediaTek | Medium | Many modules require root + Engineer Mode; some MTK-specific 4G modules exist | | Exynos (Samsung) | Low to Medium | Proprietary RIL; only basic build.prop changes work | | Huawei Kirin | Very Low | Locked radio interface; modules often fail or cause bootloops |