Good Morning @kathyy.usg9gq,
Transferring user content from your G1 to a new phone shouldn’t be all that horrible. Unlike when you factory reset your phone previously, you won’t lose any information in the process. @melissal.w8wvru is quite correct, most user content should already be synced with your Google (Gmail) account. She’s also correct, you may acquire the Moto G5 PLUS and transition service from your G1 at your leisure. Meanwhile, the G5 PLUS will function as a mini WiFi tablet. More detail follows:
When ready, you’ll start the activation process. Republic offers a great walkthrough here: Activate | Republic Wireless.
Any user content synced to your Google account will sync back to your new phone when you add the same Google account used on your current phone to the new phone.
On your current phone, at Settings -> Backup & reset, please verify both Backup account and Automatic restore are toggled on.
You will be presented the opportunity during activation to restore that which is synced to your Google account from another phone linked to the same Google account.
Once past initial phone setup, you will be prompted to sign into the appropriate Republic account. To upgrade an existing line to a new phone, select “replace existing line”. You should see the phone number you want to replace listed at this step. Continue through the activation process, then you’re all set! Some guidance from Republic here: Activate My Phone.
Once again, @melissal.w8wvru is correct, Motorola no longer supports Motorola Migrate. For that which is not synced to your Google account, please try one of the following options:
Easy Backup & Restore:
https://play.google.com/store/apps/details?id=com.mdroidapps.easybackup
Copy My Data:
https://play.google.com/store/apps/details?id=com.mediamushroom.copymydata
Phone Copier:
https://play.google.com/store/apps/details?id=com.compelson.migrator
SHAREit:
https://play.google.com/store/apps/details?id=com.lenovo.anyshare.gps