Modem compatibility breakdown: PLS8 http://m2m.gemalto.com/tl_files/cint...t_PLS8_web.pdf For now it's unclear if there will be a non-economy global PLS8 version available, that merges the capabilities of the -E and -US variant. recommended version for LTE in Europe and some other countries, supports EU-3G and EU-2G but limited roaming capabilities, not even GSM quadband, so no roaming to e.g. USA > PLS8-E: Quad Band LTE: 800/900/1800/2600 MHz, FDD-Band (20,8,3,7) Tri Band UMTS (WCDMA): 900/1800/2100 MHz, FDD-Band (8,3,1) Dual Band GSM/GPRS/EDGE: 900/1800 MHz LTE: NOT COMPATIBLE UMTS: NOT COMPATIBLE 2G: unclear if AT&T supports any GSM, anyway the PLS8-E does not support the usual US-GSM 850/1900 bands.