[AHOHA]

I've been looking for a portable router with this specs:

1- Support DD-WRT ( that included VPN, smart routing and other features)
2- Have SIM card slot 3G/4G ( Not an external dongle)
3- Ethernet Connectivity.

I have MiFi, but its limited for 10 devices, no advanced options like dd-wrt;.

So, is there such a product, where all the 3 features included?
Note: you can get 2 of them but not all in one product.

[b-man]

do you need all in one?
merge your Mifi with a DD-WRT router for home but walk off with just your Mifi when you want portability

http://www.flashrouters.com/blog/2012/03/26/dd-wrt-router-benefits-advantages-5-taking-full-use-of-a-3g-usb-dongle-or-4g-mifi-mobile-hotspot/

or see if any of these supported routers do it all
http://www.dd-wrt.com/wiki/index.php/3G_/_3.5G

i did find this i dont know if these are something that may interest you
http://linkte.sell.curiousexpeditions.org/pz6f50ab7-openwrt-ddwrt-bus-car-wifi-router-with-3g-sim-card-wifi-hotspot-high-speed-wifi-hotspot-4g-lte-router-oem-openwrt.html

[maesson]

I'm trying to do more research on this device, but I think it may fit the bill:

http://www.dhgate.com/product/2015-wifi-tp-link-extender-roteador-3g-wireless/255843635.html

[Governa]

Doesn't tick all your boxes but I'm running a DIR-505 flashed with Gargoyle (based on OpenWRT) and a 3G dongle. Quite small, cheap to buy and works fine.

[daniel-2016]

[hans_meier]

I think this could be for you (if you're still looking)
GL-MiFi
https://www.gl-inet.com/mifi/#