The 4G LTE communications is the best choice today for a cellular module. There are modules available with global coverage and modules for specific regional usage with many features.
All the 4G LTE module offer seamless fall back to 2G and 3G networks in many frequency bands, hence the great coverage booth indoor and outdoor.
A variety of different features are available with: from Cat-1 upto Cat-20 in-roadmap, voice, data, VoLTE, SMS, Java, GNSS, MiMo, FOTA, USB 3 to fit all you needs for new product.
Furthermore, the module comes with many Certificate and Mobile Operator approvals. This reduces the development time & money need for qualifications testing.