The best replacement for hsdpa is 3g.

The best alternatives to hsdpa are rated as following:
★★★★★  3g
★★★★  umts
★★★  hsupa
★★★  evdo
★★★  wcdma
★★  edge
★★  hspa+
★★  cdma
★  hspa
★  lte
★  wimax
★  3g faster
★  ev do
  wcdma which is faster
  ev-do
  hspa+ difference
  3g which is better
  hspa faster
  umts faster
  3g speed
  gprs
  r99
  cdma2000 evdo
  evdo rev a
  umts which is faster
  hsdpa+

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Speaking about hsdpa, one probably shouldn't forget about 3g.

Other search terms related to hsdpa and their ratings are:
★★★★★ 3g
broadband
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Google Trends

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hsdpa
3g
umts