Your membership record: your details, your phone, your kit size. You can change it yourself whenever you like, and the committee sees the change without you having to tell anyone.
Keep your email and mobile up to date: that is where notices and meeting calls arrive.
Your membership card on the phone, with your photo and a code. It identifies you at events: somebody scans it and that is it.
Open it once on the phone and save it to your home screen: then you have it even with no signal.
It appears on the card and on your record. Upload it from your record: face on, recent, decent light. With no photo the card is far less use.