Babban matsalar da ke da alaฦa da inganta lambobin wayar hannu a cikin siffofin HTML shine cewa babu daidaitaccen tsarin lambobin wayar hannu. ฦasashe daban-daban suna da tsari daban-daban don lambobin wayar hannu, yana da wahala a ฦirฦiri ฦa'idar tabbatar da duniya wacce ke aiki ga dukkan ฦasashe. Bugu da ฦari, wasu ฦasashe na iya buฦatar ฦarin bayani kamar lambobin yanki ko lambobin ฦasa, waษanda zasu iya dagula aikin tabbatarwa. A ฦarshe, akwai nau'ikan haruffa da alamomi na musamman da aka yi amfani da su a wasu nau'ikan lambobin wayar hannu waษanda kuma zasu iya yin wahala ฦirฦirar ฦa'idar tabbatarwa.
<form> <label for="mobile">Mobile Number:</label><br> <input type="tel" id="mobile" name="mobile" pattern="[0-9]{10}" required><br> <input type="submit"> </form>
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