Unlimited residential proxies can theoretically provide the ability to have unlimited sessions, but whether it is truly "unlimited" depends on multiple factors.

From a technical perspective, unlimited residential proxy services provide users with great flexibility and anonymity by simulating the network environment of real residential users and using real residential IP addresses for network access. 

In theory, as long as the proxy service provider's server resources are powerful enough and there is no limit on the number of sessions, users can have unlimited sessions. However, in actual applications, the "unlimited session" capability of unlimited residential proxies may be restricted by the following factors:

1. Server resource limitations: 

Although proxy service providers may claim to provide unlimited sessions, their server resources (such as bandwidth, processing power, etc.) are limited. When the number of simultaneous sessions exceeds the server's carrying capacity, it may result in performance degradation, slow response speed, or even service interruption.

2. User behavior restrictions: 

Some proxy service providers may limit the number of sessions based on user behavior (such as request frequency, data usage, etc.). If the user's behavior is considered malicious or beyond a reasonable range, the service provider may take restrictive measures.

3. Restrictions on contract terms: 

In the contract signed with the proxy service provider, there may be clear restrictions on the number of sessions or related terms. Users need to read the contract terms carefully to ensure that their use behavior complies with the regulations.

In addition, it should be noted that although unlimited residential proxies provide great flexibility and anonymity, they may also bring some potential risks. For example, due to the authenticity and anonymity of the proxy IP address, it may be used for illegal activities (such as cyber attacks, data theft, etc.), causing unnecessary trouble to users.

Unlimited residential proxies can theoretically provide unlimited session capabilities, but in actual applications they may be restricted by a variety of factors. Therefore, when choosing and using unlimited residential proxy services, users need to carefully evaluate their needs and risk tolerance, and choose a reliable service provider and a suitable package plan.