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 |