This is a modular x64 mini pc/ smart phone im putting together instead of buying a new handset. i dont care much if its thick, so deal with it.

Parts:

5" regular screen: 50$(the 5" version) 

https://www.amazon.com/OSOYOO-Portable-Raspberry-Compatible-Raspbain/dp/B07KKB5YS9/ref=redir_mobile_desktop?ie=UTF8&ref=ppx_pop_mob_b_asin_title&th=1

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Cellular hat with IoT frequency card and sim includes antenna: 107$ (need north american version)

https://sixfab.com/product/raspberry-pi-4g-lte-modem-kit/

OR

*Cellular hat without cellular card for cellphone frequency cards, no antennas: 39$

https://sixfab.com/product/raspberry-pi-base-hat-3g-4g-lte-minipcie-cards/

Cellphone cellular card: 113$(this one is american) 

https://www.amazon.com/Lenovo-Sierra-Wireless-Thinkpad-Broadband/dp/B01F6SN1GA

*needs 4g, 3g, and gps antennas if using non IoT card

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Camera 8MP: 40$

https://www.adafruit.com/product/3099

Mobo: newest raspberry pi4B has 2-8gb ram (i got the 4gb version for 50$)

https://blog.adafruit.com/2019/06/24/raspberry-pi-4-model-b-raspberrypi4-raspberrypi-adafruit-adafruit-raspberry_pi/

Power management: 46$ (5v 8A power supply and shutdown control, charges batteries while plugged in; requires high current 3.7v battery)

https://geekworm.com/collections/ups-hat/products/raspberry-pi-4b-3b-3b-x708-ups-hat-power-management-board-with-cooling-fan?variant=33168596926552

Battery: 50$ ( 8A discharge current 3.7v)

https://power.tenergy.com/at-tenergy-li-ion-3-7v-10400mah-side-by-side-rechargeable-battery-pack-w-pcb-1s4p-38-48wh-8a-rate/

sd card i used:

https://www.amazon.com/Samsung-Select-microSDXC-Adapter-MB-ME128HA/dp/B0887GP791/ref=sxin_7?ascsubtag=amzn1.osa.e8d30ad1-5a61-4f22-bc10-06f9910a30d8.ATVPDKIKX0DER.en_US&creativeASIN=B0887GP791&cv_ct_cx=mini-sd+card&cv_ct_id=amzn1.osa.e8d30ad1-5a61-4f22-bc10-06f9910a30d8.ATVPDKIKX0DER.en_US&cv_ct_pg=search&cv_ct_wn=osp-single-source&dchild=1&gclid=CjwKCAjw9vn4BRBaEiwAh0muDLvXyi3VHV7XMf2j2cdpPNC5jt4XekmXmRyQWNXmKDn8glOvir9sCxoCmXAQAvD_BwE&hvadid=241916915433&hvdev=c&hvlocphy=9030754&hvnetw=g&hvqmt=e&hvrand=13663693035350472525&hvtargid=kwd-3175133916&hydadcr=24663_10400924&keywords=mini-sd+card&linkCode=oas&pd_rd_i=B0887GP791&pd_rd_r=5172213b-e5ac-4dac-a9f6-9ff78603ce8a&pd_rd_w=qPyTy&pd_rd_wg=NXHQu&pf_rd_p=76540515-1aa7-4007-99bf-d21bc7d2acc8&pf_rd_r=13TZF6H1TZ7QTB033JCY&qid=1595850928&sr=1-1-72d6bf18-a4db-4490-a794-9cd9552ac58d&tag=googhydr-20

optional: 

5.5 AMOLED screen: 120$

https://www.amazon.com/5-5inch-HDMI-AMOLED-Resolution-Capacitive/dp/B07N8WWDRK