wireless broadband 3G/4G

[Bopple]

Live in fringe area for reception. Have Sierra 320U . external aerial and Netcomm N150 Router. 3G signal 18dBM works fine. Last month or so  has been switching to 4G and internet slows to a crawl. signal strength drops to 7 to 14dBM and sometimes nothing, this flipping 3G/4G can happen for hours and is very frustrating.

I can't see that the modem can be set to 3G only. If it is possible then life would be a lot easier.

Can any one help please

[Caaf]

Have a look through this post http://crowdsupport.telstra.com.au/t5/4G-Broadband/Overcoming-frequent-dropouts-with-Telstra-4G-dong...

Hopefully there's a solution there for you