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Sylvain Munaut 246tnt at gmail.comHi,
On Wed, Jan 25, 2012 at 3:02 PM, Dave Schmidt <dvsm89 at gmx.com> wrote:
>> why should two phones use uplink frequency to communicate directly
>> together? why not using downlink frequency?
>
> Because in most if not all counties transmission on downlink frequency requires a license?
Transmitting on uplink _also_ require a license ... you're just using
the license of your operator that delagated the right to you to
transmit in uplink when they sent you a IMMEDIATE ASSIGNEMENT.
But I can assure you if you start txing in the uplink of an operator,
they'll complain ...
Here in BE, the license clearly lists both the uplink and downlink
frequencies when you're allocated a GSM test license.
Cheers,
Sylvain