How much does it cost ? Your monthly cost will be made up of a number of factors. Phone system rental (charged per channel). Any optional free call bundles. Any phone numbers (DID's). Call/SMS charges which were outside you bundles. Check our estimator here pricing page. Phone system rental is elastic. The concept is simple, you want more call handling capacity, you pay more – you need less, you pay less. Everyone gets all the features and extensions are free. A good analogy is to imagine your phone system as a hardware unit which needs a telephone cable for each call in or out. Adjusting capacity is like adding or removing cables, but the cables are virtually managed by dragging a slide bar in your browser. Note that call capacity is calls in and out, calls between extensions or the number of extensions you can have are not affected. see also: How do I know what my monthly charges will be ? Can I have it FREE ? How do I change the monthly cost ? Take our free trial (you will be pleasantly surprised).