A full service agency is one that can provide all marketing services under one roof. Basically this is it; usually an agency that has a lot of resources could be described as 'full service' as they can take control of your campaign from start to finish. You can get best msp marketing services through various online source.
Are Full Service companies more expensive?
Generally they are more expensive than engaging a freelancer or smaller agency that needs to outsource – however the benefits may outweigh the costs. Sometimes it is worth paying that little bit more in order to get better results.
What services are covered?
Most marketing services would be covered generally with the exception of telesales and sales training:
All agencies vary so some may outsource some of the above, but it will be a case of checking agency by agency.
Possibly the best reason for using a full service agency is that they can support your campaign as it grows. So rather than using one agency for your website, then as things grow using another for graphics, you have everything covered. This helps with the brand also, and there will be no learning curve.
It is always worth comparing a few agencies in order to get a feel for their experience in your industry and also the costs. All agencies tend to charge differently, so shopping around is always recommended.