How to keep Recent Call Record more than week iPhone

You can't.  It only keeps a set number of calls.

It's not a set time frame. The recent call list(All) is limited to 100 calls exactly, if you have a contact that shows say 2 calls, then the list will only show 99 entries, but the limit is number of calls and it is exactly 100.

I have to disagree with your response with respect. My i phone is limiting me to call going back only 7 days ie today is 29 July and my call log will only go back to 22 July. I have only 40 calls logged for that period. I cannot view up to the 100 you mention. I have included all calls for a single caller as well ie one caller shows 7 so ive counted that as 7 calls. There appears no way to set up to 100 in the settings

Thanks

Graham