Building modem with raspberry pi

Hi! It's nice to meet you. I'm Matías a sysadmin with high skills in this kind of configurations as you can see in my freelancer's profile with other projects finished to install Raspberry PI with a 4G dongle for the same request like yours and for 4G cluster proxies. You will have a guaranteed job, easy to manage and with professional support. After finish this project you can access to +5 days of extended support without additional fees. ** We can chat for more details and make a workflow so you can know all the tasks needed to complete the install as your needs. About me I'm a proactive sysadmin with +10 years of experience in IT Consulting with high skills in Linux, Cloud AWS/GCP/OVH, Virtualization Hypervizors VMware/KVM/Xen/Citrix, Windows Server Active Directory/Desktop/Group Policy, Web Hosting and High Availability Server (HA) with load balance. We have a NOC in the city of Buenos Aires to monitoring +250 cloud for our private network and +125 customer from different countries with Spanish and English support 24x7.

Technically you could set raspberry Pi as an access point, just need to present the port forwarding module

Have a lot of experience in Raspberry PI 3 Model B. I have did projects in my college as well. This project can be done. Also I'm very good at networking. I'm currently doing intern in Cisco. So I'm very much interested in doing this project. I can even work for less that 25$ negotiable, provided all the components required. Kindly mail me. Waiting for your response.