It usually includes multi-core processor and GPU in a 4G mobile phones. The most popular processor architecture is base on ARM, a family of famous RISC CPU which owns more than 90% marked share inside mobile phones.  Nowadays, Cortex-A50, Cortex-A53, Cortex-A57, all support multi-core processor, are the most popular ARM architecture used in popular 4G mobile phones. 

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              Samsung Galaxy Core 4G  has the following processor :          

                       ----   1.2GHz dual-core,  OR                                        

                        ----  Combine T-Mobile's 4G network with a Qualcomm®                                                    1.5 GHz dual-    core processor,  OR

                       -----  “Little” 1.2GHz quad-core chip, but when things get                                                       more stressful,   a “Big” 1.8GHz quad-core chip                                                          (based on the same ARM    Cortex A15 architecture                                                    as the Tegra 4).  

                     ------   containing a quad-core 1.9 GHz Krait 300 CPU.

        Motorola Moto E -  CPU:

          The Moto E is packing a 1.2GHz dual-core Snapdragon 200               

           processor backed by 1GB of RAM.

Application Processor (Multi core) ARM Cortex And  series and ARM CORTEX -R and based Processors for 4G Modem, WiFi and BT