day to day routine is different through out the corps....
You could be in a fast acting, hard working unit where you are always doing something worthwhile (ie 30 Sigs a few years ago).
Or you could be sweeping the hangers.
I would suggest, if you are intelligent enough, you look in to CS Engr. Alot of good things happening there, and it is a good trade. CS Op is staggering abit, with a lot of Ops having no real role other than greasing things and sweeping things.
Infantry is a good job, as mentioned above. You'll never have a dull day, but the two are vastly different.
Good news is, as a Royal Signals chap you can be attached to the Inf, either for jobs or long term with new posts being opened up in the Inf Bns for us.
And you have the options of trying for Para, Commando and SF support.
Paywise Inf and RSignals are identical. Lower band for private, Higher for all up to Sgt, then Lower again for SSGt/CSgt. There are some SSGTs and above on higher but you'll find out about those when you join.
You will likely maky LCpl earlier inthe RSignals than the Inf mind.