The 19-year-old was freed from Portland Prison in Dorset, south-west England.
Aamer, then a rising star of world cricket, was one of three Pakistan players jailed by a judge in London in November over their roles in a plan to bowl deliberate no-balls during a Test against England at Lord's in August 2010.
However, he cannot immediately return to cricket as he is serving a five-year ban from the sport imposed by the International Cricket Council (ICC) for his role in the scandal.
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