FCC Docs Suggest AT&T Planning LTE in the 850 Band
The FCC this week approved a unique phone with specific radio functions that suggest AT&T may be planning to deploy LTE technology in the 850 Mhz frequency band. The Pantech P9070 will be the first phone to support LTE 850. It also supports the standard set of modes for an AT&T LTE phone, including LTE in the 700 and 1700 bands, plus GSM and WCDMA. The specific LTE 700 band supported by the P9070 - band 17 - is unique to AT&T. AT&T deploying LTE in the 850 band could be a "plan B" in case the company is unable to purchase T-Mobile USA. Re-farming the 850 MHz band for LTE would allow AT&T to deploy a robust LTE network nationwide, although migrating customers away from GSM and WCDMA technology in that band - without disruption - could be challenging in many markets.
so they have no problems switching 850mzh to LTE !