JMP.chat is described as 'Access phone numbers from any device with internet: supports voice, SMS, MMS (pictures and group texting). Entirely open source stack and works over open protocols (XMPP)' and is an app in the Social & Communications category. There are six alternatives to JMP.chat for a variety of platforms, including Android, iPhone, iPad, Online / Web-based and Android Tablet. The best alternative is Google Voice, which is free. Other great apps like JMP.chat are MySudo (Freemium), Line2 (Paid), TextNow (Freemium) and YouMail (Freemium).
Google Voice gives you one number for all your phones, voicemail organized in an email format, free US long distance calls, low rates on international calls, and many free calling features, including transcripts, call blocking, call screening, conference calling, SMS, and more.
Line2 is a VoIP phone service that lets you call & text from a separate phone number via WiFi or 3G/4G/LTE. At a small premium, Text & call ANYONE in the US/Canada, forwarding & more. Pick any phone number.