<prompt> tafsiri zifuatazo kutoka kwa swahili hadi kiingereza.mwongozo huu wa mnunuzi wa guardian kwa simu bora za rununu ulisasishwa mwisho 17 desemba 2019, na inawakilisha mifano bora inayopatikana wakati huo.  <response>: this guardian buyers guide to top-end smartphones was last updated on 17 desemba 2019, and represents the best available models at the time. 