Availability and limits depend on each operator.
https://script.jumgoo.com/forum.php?mod=viewthread&tid=29229&extra=
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http://myweed.rocks/viewtopic.php?t=48411
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https://foro.murenacidos.com/showthread.php?tid=19267
https://catrachosporelmundo.com/index.php?topic=4172.new#new
https://my-mobile.eu/viewtopic.php?t=9304
http://www.lada-xray.net/showthread.php?p=247640#post247640