The best replacement for 3g mobile is data card.

The best alternatives to 3g mobile are rated as following:
★★★★★  data card
★★  2g

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Speaking about 3g mobile, one probably shouldn't forget about dual camera.

Other search terms related to 3g mobile and their ratings are:
★★★★★ dual camera
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Google Trends

Scale is based on the average worldwide traffic of 3g mobile in all years. Click on graph for more.
3g mobile
data card
2g