One of many signals near 877 MHz

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One of many signals near 877 MHz
Frequencies 877.875 MHz
Frequency Range 877.875 MHz - 877.875 MHz
Mode NFM
Modulation 4FSK
Bandwidth 2.55 MHz
Location Barnwell County, South Carolina
Short Description Probably 3G or 4G cellular signals
I/Q Raw Recording
Audio Sample

Here is a download link to a 7-zipped IQ file (81 MiB). I asked about this on the GNURadio mailing list and they say it is 2 adjacent signals, either IS-95 or CDMA2000.