How do I get my standard phone apps back after a root?

[AC Question]

deleted standard phone app (root)

Hi guys,
I ve rooted my phone and started replacing some of the standard apps for apps which take up less memory, i came to replace my contacts but have deleted my phone app ( green box with white phone) ive done a factory reset, looked for backups but theyre now gone, tried going online but havent found any sites to download the app from, and when ive looked on the network settings ive found the phone is not reading my sim card any suggestions?

Thanks in advance