Contracts generally have terminations clauses allowing either party to eventually end the obligation imposed on them by a contract. E.g. the buyer may have to notify the seller of termination in writing; the service may, at its sole discretion, terminate a user for breaking the rules; the agreement may terminate on a specific date and so on. In principle, a contract could be written in such a way that the service has the right to terminate the agreement, but the customer cannot terminate the agreement (so they are stuck with that cell service provider for life). Assume that the contracts in question are contracts of adhesion (take it or leave it, customer). In the scenario, (1) there may be an explicit statement that the customer is perpetually bound or (2) there is no statement regarding termination by the customer: I assume the answer is different depending on whether the contract is silent.
Is there any statutory or case law that addresses the enforceability of perpetual contracts (general common law, unless the answer is too jurisdiction in which case US)? I understand that a contract can obligate a customer to do something in exchange for receiving X, so I'm not asking if quid can be extinguished when there exists a viable quo within the statute if limits. I am also not asking about perpetual copyright licenses.