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These are limitations of those devices.- At this time, the in-app map is only used for showing current location. There is no such thing as an LTE signal booster app, what actually happens is forcing the device to search again for the best signal rather than staying connected to an older, possible stale connection.- Not all devices/carriers are supported for LTE bands and other advanced signal data. Many thanks to the community for the support and the questions and feedback.- Best signal available doesn't mean this app can make LTE appear where there is none. LTE Discovery is a powerful signal discovery and analysis tool with many advanced features and customizations available.Key features:- Identifies LTE band for Verizon, AT&T, Sprint, T-Mobile, and several other countries (support for more carriers added with the crowdsource feature and user aid)- Identifies EARFCN and Band for any country/provider when using a Qualcomm processor and ROOTED- Live band identifier and signal data in the notification bar- Refresh cell radio (reset data connection) to connect to best signal available* (Note: Google added restrictions in Lollipop and above, so it may require root or be unavailable)- Automatic refreshing of mobile radio for different conditions- Alert notification for LTE bands and GCIs (connected and disconnected)- Save LTE logs- Automated visual logger (Sprint + Pro only)- EARFCN band calculator (range and precise UL and DL frequencies) (Pro)- Wide range of settings to customize your experience (Pro)- Advanced LTE, 4G, 3G, GSM, CDMA data (GCI, PCI, TAC, RSRP, RSRQ, band, EARFCN, frequency)Disclaimer:- This is an advanced app with some features specific to only some devices/carriers.