Systems and methods for providing online access to multiple mobile station international subscriber directory numbers (MSISDNs), or mobile numbers, with compatible internet-connected user equipment (UEs). The system can include a web portal through which users can send and receive voice calls, video calls, text messages, e-mails, and other communications via multiple authorized mobile numbers. The system can include a graphical user interface (GUI) to enable users to select a mobile number to place a call or send a text, for example, with the call or text appearing to be sent from the mobile number. The system can also route incoming calls and texts to both the UE associated with the mobile number and the web portal. Thus, an incoming call, for example, can ring on both the UE and a tablet or laptop computer substantially simultaneously.