You should pursue patents if:
A) You have the resources available to enforce it, and litigate those who infringe on your patent
B) If you want your company to be more attractive to potential acquirers who do have the resources to enforce it
It looks like you're dealing with software though, which in most recent cases is very hard to patent.
Your strategy of trying to pre-sell to telecoms businesses sounds great, however you need traction to create leverage. Ideas are worth nothing, they are cheap and if all that's preventing someone from "stealing" your idea is you telling them, then that idea is going to be very hard to start a business around.
Instead of valuing "ideas", try to shift your perspective to value "execution" instead. If your idea is truly pivotal, you should be able to gather a small user base and demonstrate value. There will be problems you face while implementing your idea, and your unique solutions to those problems create value.
Once you create and demonstrate that value, you can then sell it, license it, etc. It will be a much simpler conversation.
Happy to discuss further if you like.