The best replacement for hspa+ is lte.

The best alternatives to hspa+ are rated as following:
★★★★★  lte
★★★★  4g
★★★  3g
★★  wimax
★★  hsdpa
★★  hspa
★  lte at&t
★  lte t mobile
★  lte speed
★  lte battery life
  hsupa
  4g lte
  dc-hsdpa
  lte 4g
  wcdma

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Google Trends

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hspa+
lte
4g