The best replacement for a15 is a19.

The best alternatives to a15 are rated as following:
★★★★★  a19
★★★  a9
★★★  a7
★★  e12
★★  krait 400
★★  a57
★  a17
★  a6x
★  snapdragon s4
★  krait
★  a53
★  micromax a68
★  micromax a89
★  a68
★  a19 light bulb
★  a89
  micromax a87
  quad core a9
  a19 bulb
  snapdragon 600

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Speaking about a15, one probably shouldn't forget about airtel offer.

Other search terms related to a15 and their ratings are:
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