4g router

Have you got a wireless adapter in your solo2, if you have you could create a wifi hotspot on a 4g phone and test it. I tested a 3g router and got some glitching but when testing my solo4k with my 4g hotspot on the phone it seemed to work fine.

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i have very slow broadband and thinking of updating to a 4g router will i still be able to run my solo2 using the 4g router?

I too am in the same boat as you. I've purchased a 4G router and have been running it alongside my fixed line broadband for the past 2 months.
My eir fixed line d/load is 3.5mb at best with a tiny 330kb upload (useless for a server of any description really)
Currently I'm getting between 12-24mb d/load and 10-16mb upload with only 3 bar signal on the 4g router (can go to 5 bar).
A vast improvement.
I'm in the process of installing an external antenna which should improve this further (hopefully the full 5 bars).
I've been running my solo2 and os-mini from it (as client) without much issue and my other vu's (client also) from my fixed line to compare stability (odd glitch every hour but nothing you can't live with)
My server is located in my brothers home as he has higher upload speed (1mb) than me.
My goal is to run my server at home on my 4g network (then stick plex onto it also) and get rid of fixed line altogether as speed is poor for day to day internet/streaming/etc (wife works from home on the net which is the main driving force behind it and am left with few alternatives) and am paying €50 a month from those robbing eir b*$t#%ds, but there is a problem with 4g and forwarding ports (definately southern ireland and may be the rest).
Unless your a business subscriber to v/fone 4g (maybe others but I haven't contacted any as other providers d/load cap is minuscule, vodafone seem to offer the biggest cap) , this is only possible through a third party service they use (asavie.com , looks like a business vpn for want of a better way to describe them)
This route though means a contract and all the crap that goes with it, also , large cost per mb if you go over cap and getting signed up as a business may be tricky unless you have vat number etc.
I'm currently running it on a payg 3 mobile sim (€20 a month) and am happy with it so far.
Only way to setup/run a server on 4g due to closed ports etc is use a vpn which will route port traffic back to you .
A few offer this option.
I'm trying out airvpn atm on a raspberry pi and it looks promising so far.
If it works, I'll tackle the outdoor antenna then and move everything across to 4g (will be nice to have decent access to my cloud and plex when i'm away from home) and cut my broadband bill more than half with a service that's currently 4 times better than my current one.
This is the router and antenna I went for:

https://www.amazon.co.uk/gp/product/B019N2QCP2/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1
https://www.amazon.co.uk/gp/product/B018HJTN3A/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

If you have an old router, you could tether it to their one.
Loads of tutorials on how to do it.
I'd recommend dd-wrt firmware on old one (if it is compatable)

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http://www.dd-wrt.com/site/support/router-database

A network switch may also do the tick (probably no need to interfere with settings on their router at all then)

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https://www.amazon.co.uk/NETGEAR-GS105UK-Gigabit-Unmanaged-Ethernet/dp/B0000E5SEQ/ref=sr_1_3?s=computers&ie=UTF8&qid=1482502026&sr=1-3&keywords=network+switch