Dual SIM Active Vs Standby - Difference

Difference between Dual SIM Active Vs Dual SIM Standby: Dual SIM mobile phone is one which holds two SIM cards. Initially, dual-SIM adapters were made available to use in regular mobile phones to allow them to contain two SIMs, and to switch from one to the other as required. This combination is called a standby dual-SIM phone. The first Dual SIM mobile phone was Benefon Twin manufactured by Benefon in Finland. It was launched on the market in 2000.
Dual SIM Stand By: It simply means that your mobile will be in connection with both mobile service providers at the same time and you can either place or receive a call on either of the mobile numbers. But, as you are busy with one number, the other number goes "Not reachable"
Dual SIM Active: Your calling party will never hear "Not reachable" message if he calls you on second mobile number when you are busy on talking on first number. He will be just on "waiting" that time.
Dual Active mobiles use TWO processors to handle both SIM where Dual Stand By mobiles uses only ONE processor to handle both SIM. In November 2007,Verzio a Singapore-based 3C (computing, communications, consumer electronics) brand launched the world's first 3G Dual-Triband dual-SIM model named Duplii. The same brand also launched the Twinn, 2.75G dual-SIM model. Powered by 2 processors, the Duplii and Twinn provide real dual-SIM real dual-connecting capability. There are some little-known Chinese companies supplying inexpensive dual-SIM mobiles, mainly in asian countries. The latest models includes W006- Dual SIM & Dual IMEI Mobile Phone, The M60 - Quadband Dual SIM Touchscreen mobile phone was launched in April 2010 being the 1st of the Chinese touch screen only mobiles with no keypad, including many features WiFi, Dual IMEI, Media playback & camera ect to rival normal mobile phones. Philips has made models Xenium 9@9w and 699 with this capability belonging to the restart to change active-line generation. samsung also released the D880 DuoS in November 2007, a slider which can hold two SIM cards with simultaneous standby and the D780 which came much later both have limited function on the 2nd sim card, and there is a Windows Mobile based dual-sim phone too, called E-TEN glofiish DX900 (released in November 2008, been renamed to Acer Tempo DX900 in January 2009, after Acer bought E-TEN). Popular Indian mobile companies such as karbon,spice,micromax, Lemon Mobiles, LAVA Mobiles launch many features phone with Dual SIM technology. Even few smart phone from these companies are Dual SIM based. Nokia has now launched two dual SIM phone models C2-00 and X1-01. Both are 2G phones.