GSM-900, EGSM/EGSM-900 and GSM-1800
GSM-900 and GSM-1800 are used in most parts of the world (ITU-Regions 1 and 3): Africa, Europe, Middle East, Asia (apart from Japan and South Korea where GSM has never been introduced) and Oceania.
In common GSM-900 is most widely used.
GSM-850 and GSM-1900
GSM-1900 and GSM-850 are used in most of North, South and Central America (ITU-Region 2). In North America, GSM operates on the primary mobile communication bands 850 MHz and 1900 MHz. In Canada, GSM-1900 is the primary band used in urban areas with 850 as a backup, and GSM-850 being the primary rural band. In the United States, regulatory requirements determine which area can use which band.
Generally the 900 MHz of Sidewalk is only legal in GSM 850 countries. Most of the world is GSM 900.
https://en.wikipedia.org/wiki/GSM_frequency_bands
You don't have to believe Wikipedia. Look up FCC and any Western European Regulator such as Comreg or Ofcom.
Sidewalk's actual BLE, Bluetooth, is 2.4GHz. The 900 MHz is LoRa
Quote:
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LoRa uses license-free sub-gigahertz radio frequency bands like 433 MHz, 868 MHz (Europe), 915 MHz (Australia and North America), 865 MHz to 867 MHz (India) and 923 MHz (Asia).
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The 900 Mhz LoRa Sidewalk is illegal in most of the word. European models wouls have to use 868MHz.
Similarly people can buy US low band Remote controllers and they are illegal elsewhere, 315 MHz (I think), vs 433 MHz in Europe.
USA FRS is 462 and 467 and illegal elsewhere. Europe uses 446 MHz.
The USA Licence Free 900MHz is actually 915MHz and illegal in most of the rest of the world, Europe is 864 MHz.
But also the power level limits are quite different. The European 862 MHz and 433 MHz are only for short range devices, a similar range to 2.4 GHz, used for Bluetooth and WiFi, though BT is much lower power thus shorter range.
One problem now is people buying US devices outside of USA.
This system shouldn't be using 900 MHz at all.