Best Mobile CRM for Door-to-Door B2B Sales?

I'm looking for a CRM, but my biggest concern isn't what the desktop version can do.

My sales team is rarely at a desk.

There are four of us, and a typical day involves driving between businesses, following up on warm leads, occasionally walking into a cold prospect and making calls in between appointments.

What I need is something that works well in this situation:

You're parked outside a business and have two minutes before walking in.

You pull out your phone and quickly check the company name, address, main contact and previous conversation history.

After the meeting, you add a short note, schedule a follow-up and move on to the next stop.

That's really the experience I'm trying to optimise.

We also need the usual CRM features for account management, follow-up appointments, calling and keeping in touch with existing customers. Bulk email capability would be useful too.

The team is small, and I'd like to keep the total cost under about $80 per person per month, including setup costs over the first year.

I'm considering a couple of the more affordable CRM options, but I'd really like to hear from people who actually use their CRM primarily from their phone.

Which CRM has the best mobile app for road-based sales in your experience?

Not necessarily the CRM with the longest feature list. I'm more interested in the one that makes it genuinely quick to find customer information, log activity and schedule the next step without feeling like I'm trying to use a desktop application on a small screen.