Editing Smartphone (section)

==Lifespan==
{{Further|Lithium-ion battery#Lifespan|Planned obsolescence#Batteries}}
[[File:Day_4_Agbogloshie_(25891029818).jpg|thumb|[[Electronic waste|E-waste]] in [[Agbogbloshie]]]]
In mobile phones released since the second half of the 2010s, operational life span commonly is limited by built-in batteries which are not designed to be interchangeable. The life expectancy of batteries depends on usage intensity of the powered device, where activity (longer usage) and tasks demanding more energy expire the battery earlier.

[[Lithium-ion battery|Lithium-ion]] and [[Lithium polymer battery|lithium-polymer]] batteries, those commonly powering [[Mobile computing#Portable computing devices|portable electronics]], additionally wear down more from fuller charge and deeper discharge cycles, and when unused for an extended amount of time while depleted, where self-discharging may lead to a harmful depth of discharge.<ref name="Cycle-life">{{Cite journal | doi = 10.1016/j.jpowsour.2010.11.134| title = Cycle-life model for graphite-LiFePO4 cells| journal = Journal of Power Sources| volume = 196| issue = 8| pages = 3942–3948| year = 2011| last1 = Wang | first1 = J.| last2 = Liu | first2 = P.| last3 = Hicks-Garner | first3 = J.| last4 = Sherman | first4 = E.| last5 = Soukiazian | first5 = S.| last6 = Verbrugge | first6 = M.| last7 = Tataria | first7 = H.| last8 = Musser | first8 = J.| last9 = Finamore | first9 = P.| bibcode = 2011JPS...196.3942W}}</ref><ref>{{Cite journal | doi = 10.1016/j.jpowsour.2016.07.057| title = Cycle life testing and modeling of graphite/LiCoO2 cells under different state of charge ranges| journal = Journal of Power Sources| volume = 327| pages = 394–400| year = 2016| last1 = Saxena | first1 = S.| last2 = Hendricks | first2 = C.| last3 = Pecht | first3 = M.| bibcode = 2016JPS...327..394S}}</ref><ref>{{cite web |title=Questions and answers related to lithium - ion rechargeable b attery care |url=https://www.plarad.de/fileadmin/downloads/FAQ_related%20to%20lithium%20ion%20rechargeable%20battery%20care_DA1_en_0216.pdf |publisher=PLARAD Torque & Tension Systems |access-date=January 4, 2021 |archive-date=November 11, 2020 |archive-url=https://web.archive.org/web/20201111235201/https://www.plarad.de/fileadmin/downloads/FAQ_related%20to%20lithium%20ion%20rechargeable%20battery%20care_DA1_en_0216.pdf |url-status=dead }}</ref>

Manufacturers have prevented some smartphones from operating after repairs, by associating components' unique serial numbers to the device so it will refuse to operate or disable some functionality in case of a mismatch that would occur after a replacement. Locking of the serial number was first documented in 2015 on the [[iPhone 6]], which would become inoperable from a detected replacement of the "home" button. Later, some functionality was restricted on Apple and Samsung smartphones when a battery replacement not authorized by the vendor was detected.<ref>{{Cite web |last=Shahid |first=Furqan |date=2021-01-18 |title=Samsung Secretly Restricts 3rd Party Hardware Repairs |url=https://wccftech.com/samsung-secretly-restricts-3rd-party-hardware-repairs/ |access-date=2023-01-30 |website=Wccftech |language=en-US}}</ref><ref>{{Cite web |date=2018-07-26 |title=Apple apologises, releases fix for iPhones bricked by Error 53 |url=https://www.macworld.com/article/671975/what-is-iphone-error-53-and-how-do-i-avoid-it.html |access-date=2023-01-30 |website=Macworld |language=en}}</ref>