So lately I've been having a lot of lag issues while in-game. Worst of it happens when I play in Jaymod servers though it usually happens after I enter the server.

So I enter any server, I look at the player list and all I get is pure lag and nothing but. 999 Ping for about a minute or so? I get constant lag spikes as well and I'm not sure what it is that is causing this...

I am using a 3 dongle - Mobile broadband, HSPA.
When I first got the dongle it worked fine for the first month before I started getting the lags. Not sure what they could be caused by as my signal strength is perfect every time I use the thing...
Was wondering if anyone here may be of help? Are there any ways of fixing this?

I have tried setting my network settings in-game to modem but still they don't work. All I get is a lot of choppy play after setting that.
So, if suggested then I already tried