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I don't believe we really use cordless phones in the 900MHz anymore and I believe the consortiums determine which spectrums are sufficiently unused before targeting them.

Verizon and T-Mobile have some LTE spectrum in the 700MHz range for building penetration and range so I expect to see great things at the 900MHz range for lower power devices.

They say 900MHz but that's really just a rough ballpark, presumably it will use the 915MHz ISM band in America and 868MHz in Europe.

It's not just cordless phones though. Our baby monitor says it uses 900MHz. I don't know how many types of devices use 900MHz but it seems crowded to me.

Here in Silicon Valley, it's used by smart meters. All the short duration blips in the waterfall are gas and electricity meters.

http://www.w6rz.net/gqrx915.png

Rent a spectrum analyzer. Travel to every city. Plot the data. Then you will know.