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Issue: Router cannot dialup to 3g/4g, but 2g is working.

Main Cause and Solution:

Item Cause Solution
1 cellular network 3G/4G low signal in the site try to move to other place to test if can get better signal
2 antenna not gain good signal try to change another antenna. E-Lins antenna is world-wide use, please ask for dedicated antenna or get dedicated antenna for your carriers from the local antenna sellers.
3 SIM card service issue try to replace another sim card to check
4 Carrier service issue try another carrier to test