We know all that mobile phone is now very important to all we all connect by phones now distance does not matter.
I share my experience how I purchase my mobile before purchase I decide budget than compare all mobile than I purchase a smart phone.
before purchase the mobile checkout these points they help for you for specially begginers.
1) fix your budget because in low you also buy a good smartphone.
2) always check on internet their specification
3) compare with other phones offline or online.
4) try to always take good specification phone with good price.
5) Always try to get updated mobiles they have good specification
6) mostly and main point choose a branded phone they have more reliability than other local phone.
I hope this will work for you
Thank you