The best replacement for a73 is a87.

The best alternatives to a73 are rated as following:
★★★★★  a87
★★★★  a75
★★★  a78
★★★  a56
★★  a52
★★  karbonn a7
★  a70
★  ninja 4

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Speaking about a73, one probably shouldn't forget about a87.

Other search terms related to a73 and their ratings are:
★★★★★ a87
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a73
a87
a75